Does concurrence require a homicide defendant to retain the required mental state until the victim dies?

No. The required mental state must accompany the relevant criminal conduct, not necessarily the later result. If a culpable act causes death later, a subsequent change of mind does not erase the earlier concurrence. California CALCRIM 252 directs the factfinder to connect the prohibited act or omission with the mental state specified for the offense; CALCRIM 520 separately requires causation of death.

How does the federal insanity defense differ from competence to stand trial?

Under 18 U.S.C. §17, insanity concerns the offense time: a severe mental disease or defect must have made the defendant unable to appreciate the act’s nature and quality or wrongfulness. The defendant must prove this by clear and convincing evidence. Competence under §4241 concerns present ability to understand the proceedings and assist properly in the defense. A diagnosis alone proves neither, and states may use different insanity rules.

Does failure to give Miranda warnings automatically exclude physical evidence found through a voluntary statement?

No. In United States v. Patane, the Court permitted nontestimonial physical evidence derived from a voluntary but unwarned statement. That does not automatically make the unwarned statement admissible in the prosecution’s case-in-chief. Distinguish missing warnings from an actually compelled statement and from an unlawful search. Different constitutional violations and remedies must be analyzed separately.

What did Chatrie v. United States decide about geofence location data in June 2026, and what did it leave open?

The Supreme Court held that obtaining Chatrie’s Google Location History through the geofence process was a Fourth Amendment search. The short period covered and third-party storage did not defeat the protected privacy interest. It remanded the separate question whether the warrant process satisfied probable cause and particularity. The decision therefore does not establish that every geofence warrant is valid or invalid, or that suppression automatically follows.

Under Rosemond, what knowledge is required to aid and abet the federal firearm offense in §924(c)?

Active participation in the underlying violent or drug-trafficking crime must accompany advance knowledge that a confederate will use or carry a firearm. Advance knowledge means learning of it while there is a reasonable opportunity to withdraw; it is not necessarily knowledge days beforehand. Mere presence or learning about the gun too late to make that choice does not by itself satisfy this test.

What separates preparation from criminal attempt under California CALCRIM 460?

The prosecution must prove intent to commit the target crime and a direct but ineffective step toward committing it. Planning or obtaining equipment alone is insufficient; the conduct must go beyond preparation and put the plan into action. Once an attempt has occurred, voluntarily abandoning the plan does not erase it. Other jurisdictions may use a substantial-step test and different renunciation rules.

Under the federal entrapment approach in Jacobson, why is an undercover offer not enough by itself?

Entrapment involves government inducement and absence of predisposition to commit the offense before the government’s intervention. Once inducement is established, the prosecution must prove the required predisposition beyond a reasonable doubt. Merely offering an opportunity to someone already willing to commit the crime does not establish entrapment. Predisposition cannot simply be inferred from willingness produced by the government’s own campaign.

Under the automobile exception, can probable cause to find a large stolen object justify opening every small container?

No. The permissible scope depends on the object sought and where probable cause supports finding it. United States v. Ross allows searching relevant vehicle areas and containers that could conceal the object, not places it could not fit. Collins v. Virginia adds a separate limit: the automobile exception alone does not authorize entering a home’s curtilage to reach a vehicle. Vehicle location and search scope are distinct questions.

Under Model Penal Code §2.02, how do purpose, knowledge, recklessness and negligence differ for a prohibited result?

Purpose means causing the result is the person’s conscious objective; knowledge means awareness that the result is practically certain. Recklessness means consciously disregarding a substantial, unjustifiable risk; negligence means failing to perceive such a risk when one should. The latter two require a gross deviation from the relevant standard, not ordinary civil carelessness. Apply the mental state to each statutory element: definitions for circumstances and conduct are not identical to those for results.

Why is “not free to leave” alone an incomplete Miranda custody test, and what counts as interrogation?

Howes requires assessment of the circumstances and coercive pressures associated with custodial questioning; an ordinary traffic stop can restrict movement without being Miranda custody. Under Innis, interrogation includes express questioning and its functional equivalent: conduct police should know is reasonably likely to elicit an incriminating response, excluding conduct normally attendant to arrest and custody. The inquiry is not limited to sentences ending in a question mark.

Under federal Pinkerton liability, is a conspirator automatically responsible for every crime another member commits?

No. The substantive offense must fall within the conspiracy’s scope, further its objectives and be reasonably foreseeable as a consequence of the unlawful agreement while the defendant remains a member. A separate personal crime does not become attributable merely because its perpetrator also joined the conspiracy. Effective withdrawal and timing matter; mere nonparticipation in the particular act is not itself withdrawal.

What must prosecutors disclose under Brady, and how does Kyles affect materiality?

They must disclose favorable evidence, including exculpatory and impeachment evidence, when it is material to guilt or punishment. Materiality is assessed cumulatively, not by dismissing each withheld item in isolation. Kyles requires the prosecutor to learn of favorable evidence known to others acting for the government in the case, including police. Bad faith and a defense request are not prerequisites. Constitutional Brady duties are not identical to a complete open-file policy; other disclosure duties may be broader.

Does California implied-malice murder require an intent to kill?

No. CALCRIM 520 requires an intentional act whose natural and probable consequences are dangerous to human life, knowledge of that danger, and deliberate action with conscious disregard for human life, together with the other murder elements. This subjective awareness distinguishes implied malice from criminal negligence. Malice does not require hatred of the victim, and awareness of a minor risk of injury alone is insufficient.

Do all federal conspiracy offenses require proof of an overt act?

No. The general conspiracy statute, 18 U.S.C. §371, requires an act by a conspirator to advance the agreement. By contrast, United States v. Shabani holds that a drug conspiracy under 21 U.S.C. §846 does not require an overt act. Read the particular statute rather than importing one conspiracy formula into every charge. An agreement alone also does not establish every other required element.

What standard did Case v. Montana reaffirm for emergency-aid entry into a home in January 2026?

Officers need an objectively reasonable basis for believing an occupant is seriously injured or imminently threatened with such injury. The Court rejected importing the criminal-investigation probable-cause standard and did not adopt Terry’s reasonable-suspicion test either. General community-caretaking concerns are not an open-ended license to enter a home. The emergency-aid justification must actually fit the circumstances.

How does New York’s retreat rule differ from California’s in deadly self-defense?

Under New York §35.15(2)(a), a person responding to deadly force must retreat when they know they can avoid using deadly force with complete personal safety to themselves and others. An exception applies in their dwelling if they were not the initial aggressor. California generally imposes no retreat requirement for otherwise lawful self-defense. Neither rule makes excessive force or an unjustified attack lawful; apply the specific statutory branch and exceptions.

How do independent source, inevitable discovery, attenuation and warrant good faith differ?

Independent source requires a genuinely separate lawful acquisition; inevitable discovery requires proof by a preponderance of the evidence that lawful means would have found it. Attenuation examines whether the connection to misconduct has sufficiently weakened, including time, intervening events and the misconduct’s purpose and flagrancy. Leon good faith concerns objectively reasonable warrant reliance, with limits for misleading affidavits, abandoned neutrality and plainly deficient support or warrants. These doctrines concern exclusion; they do not retroactively legalize misconduct.

How can California voluntary manslaughter differ from murder and involuntary manslaughter?

A killing otherwise amounting to murder may be reduced by legally sufficient heat of passion or imperfect self-defense. Being angry alone is insufficient: heat of passion includes an objective provocation requirement. Imperfect self-defense involves specified actual but unreasonable beliefs about imminent death or great bodily injury and immediate deadly force. Involuntary manslaughter instead involves an unlawful killing without intent to kill or conscious disregard for life, with the required criminal negligence. Not every accidental death is criminal.

Under California CALCRIM 505, must an imminent threat actually exist for deadly self-defense to be justified?

Not necessarily. The defendant must actually and reasonably believe in imminent danger of death or great bodily injury and that immediate deadly force is necessary, and must use no more force than reasonably necessary. A reasonable mistake about the danger can therefore qualify. Fear of possible future harm is insufficient. Aggressor and other applicable limitations must still be considered.

In Pennsylvania, how do duress and necessity differ?

Section 309 duress concerns unlawful force or threats that a person of reasonable firmness in the situation could not resist. Section 503 necessity concerns a reasonably believed need to avoid a greater harm, subject to statutory limits and legislative exclusions. Necessity is not restricted to natural disasters. Recklessly or negligently creating the predicament can restrict either defense under the applicable provision; do not assume every emergency excuses an offense.

When do Miranda safeguards apply, and what does the public-safety exception cover?

They apply to custodial interrogation, not every conversation with police or every arrest regardless of questioning. Volunteered statements are not interrogation merely because officers hear them. Quarles recognizes a narrow exception for questions reasonably prompted by an immediate public-safety concern, such as locating an abandoned gun. It is not a general exception for questions useful to solving a crime, nor permission to compel an answer.

For California felony murder, why are participation in the felony and an intent to kill not always enough under §189(e)?

Section 189(e) requires actual-killer status; assistance to the actual killer in first-degree murder with intent to kill; or major participation in the felony with reckless indifference to human life. In People v. Morris (May 2026), the court held that the intentional-assistance route requires aiding the lethal act itself, not just the underlying felony. Section 189(f) separately excepts specified killings of an on-duty peace officer whose status the defendant knew or reasonably should have known.

Why does a lawful Terry stop not automatically authorize a frisk?

An investigative stop requires reasonable, articulable suspicion of criminal activity; a protective frisk needs a reasonable basis to believe the person is armed and presently dangerous. The frisk is limited to finding weapons for safety, rather than a general evidence search. An officer cannot justify every frisk merely by saying the stop itself was lawful. Scope and the facts supporting each intrusion must be assessed separately.

How do requests for silence and counsel differ during custodial questioning?

A request for silence must be scrupulously honored; Mosley does not create a universal waiting-period rule. A clear counsel request triggers Edwards: police generally cannot reinitiate custodial questioning without counsel present, unless the suspect initiates and validly waives the right. Shatzer permits reapproach after at least 14 days outside Miranda custody, followed by a valid waiver. Fourteen days of uninterrupted custody is not that break.

Does an arrest automatically permit a search of the arrestee’s car and smartphone?

No. Gant permits a vehicle search incident to arrest when the arrestee is unsecured and within reaching distance of the passenger compartment, or when it is reasonable to believe it contains evidence of the arrest offense. Riley generally requires a warrant to search a phone’s digital contents despite a lawful arrest. A separately established exception may apply; arrest alone does not remove these limits.

What does federal solicitation under 18 U.S.C. §373 require, and is changing one’s mind enough to renounce it?

It requires intent that another commit a qualifying federal felony involving force, an effort to persuade or induce that conduct, and circumstances strongly corroborating the intent. The solicited crime need not be completed. The statutory renunciation defense requires voluntary, complete renunciation and prevention of the solicited crime; merely postponing it or changing victims is insufficient. Do not treat §373 as a statute covering solicitation of every possible offense.

Under Strickland, does an attorney’s mistake automatically establish ineffective assistance?

No. The ordinary test requires performance below objective professional standards and resulting prejudice. Review is deferential to reasonable professional judgments, rather than hindsight alone. Prejudice means a reasonable probability of a different result sufficient to undermine confidence in the outcome, not proof that a different result was more likely than not. An unfavorable outcome or a harmless mistake alone is insufficient.

What must accompany an officer’s plain-view observation before it justifies seizure?

The officer must lawfully occupy the viewing position, have lawful access to the item, and have probable cause to recognize its incriminating character. Seeing something from a public sidewalk does not itself permit entering a home to seize it. Horton rejects inadvertent discovery as an essential requirement. Plain view is a bounded seizure doctrine, not permission to conduct any additional search needed to establish suspicion.

Under Pennsylvania §301, when can an omission support criminal liability?

Liability normally requires conduct that includes a voluntary act, or an omission to perform an act the person was physically capable of performing. An omission is sufficient only when the offense expressly makes it sufficient or another law imposes the duty to act. A mere moral expectation to help is not automatically a legal duty. Identify the duty, ability to act and remaining offense elements.

Why is “voluntary intoxication defeats every specific-intent charge” an unsafe rule?

The jurisdiction and statute control; the label alone does not decide admissibility or the defense. Pennsylvania §308 generally excludes voluntary intoxication or a voluntary drugged condition as a defense or means of negating intent, but allows relevant evidence to reduce murder from a higher to a lower degree. That is not a general acquittal rule. Other jurisdictions use different approaches, and involuntary intoxication raises separate questions.

Why does Cheek not establish that any claimed ignorance of law excuses a federal tax offense?

For the willfulness requirement at issue, a genuinely held misunderstanding of the tax duty can negate deliberate violation of a known legal duty, even if objectively unreasonable. The jury still decides whether the belief was genuinely held; implausibility can bear on credibility. Knowing the duty but believing the tax law unconstitutional is different and does not negate willfulness. This holding is not a general defense to every crime.

How do Blockburger and the separate-sovereigns rule affect double-jeopardy analysis?

Blockburger compares statutory elements: whether each offense requires proof of something the other does not. Different labels or overlapping trial evidence alone do not answer that question. Gamble preserves the separate-sovereigns rule, so federal and state prosecutions can concern distinct sovereign offenses despite the same conduct. Two agencies of the same sovereign are not automatically separate sovereigns. The procedural posture and governing punishment rules still matter.

U.S. Criminal Law and Procedure: Culpability, Defenses and Constitutional Limits

32 U.S. criminal-law and criminal-procedure review cards on actus reus, Model Penal Code culpability levels, causation, homicide and felony murder, inchoate and accomplice liability, justification and excuse defenses, Fourth Amendment searches and seizures, Miranda interrogation rules, and Sixth Amendment trial rights.

Level: advanced
Languages: en → en
Cards: 32
Markdown: U.S. Criminal Law and Procedure: Culpability, Defenses and Constitutional Limits (.md)

Flashcards (32)

#	Front (Term / Question)	Back (Definition / Answer)
1	Does concurrence require a homicide defendant to retain the required mental state until the victim dies?	No. The required mental state must accompany the relevant criminal conduct, not necessarily the later result. If a culpable act causes death later, a subsequent change of mind does not erase the earlier concurrence. California CALCRIM 252 directs the factfinder to connect the prohibited act or omission with the mental state specified for the offense; CALCRIM 520 separately requires causation of death.
2	How does the federal insanity defense differ from competence to stand trial?	Under 18 U.S.C. §17, insanity concerns the offense time: a severe mental disease or defect must have made the defendant unable to appreciate the act’s nature and quality or wrongfulness. The defendant must prove this by clear and convincing evidence. Competence under §4241 concerns present ability to understand the proceedings and assist properly in the defense. A diagnosis alone proves neither, and states may use different insanity rules.
3	Does failure to give Miranda warnings automatically exclude physical evidence found through a voluntary statement?	No. In United States v. Patane, the Court permitted nontestimonial physical evidence derived from a voluntary but unwarned statement. That does not automatically make the unwarned statement admissible in the prosecution’s case-in-chief. Distinguish missing warnings from an actually compelled statement and from an unlawful search. Different constitutional violations and remedies must be analyzed separately.
4	What did Chatrie v. United States decide about geofence location data in June 2026, and what did it leave open?	The Supreme Court held that obtaining Chatrie’s Google Location History through the geofence process was a Fourth Amendment search. The short period covered and third-party storage did not defeat the protected privacy interest. It remanded the separate question whether the warrant process satisfied probable cause and particularity. The decision therefore does not establish that every geofence warrant is valid or invalid, or that suppression automatically follows.
5	Under Rosemond, what knowledge is required to aid and abet the federal firearm offense in §924(c)?	Active participation in the underlying violent or drug-trafficking crime must accompany advance knowledge that a confederate will use or carry a firearm. Advance knowledge means learning of it while there is a reasonable opportunity to withdraw; it is not necessarily knowledge days beforehand. Mere presence or learning about the gun too late to make that choice does not by itself satisfy this test.
6	What separates preparation from criminal attempt under California CALCRIM 460?	The prosecution must prove intent to commit the target crime and a direct but ineffective step toward committing it. Planning or obtaining equipment alone is insufficient; the conduct must go beyond preparation and put the plan into action. Once an attempt has occurred, voluntarily abandoning the plan does not erase it. Other jurisdictions may use a substantial-step test and different renunciation rules.
7	Under the federal entrapment approach in Jacobson, why is an undercover offer not enough by itself?	Entrapment involves government inducement and absence of predisposition to commit the offense before the government’s intervention. Once inducement is established, the prosecution must prove the required predisposition beyond a reasonable doubt. Merely offering an opportunity to someone already willing to commit the crime does not establish entrapment. Predisposition cannot simply be inferred from willingness produced by the government’s own campaign.
8	Under the automobile exception, can probable cause to find a large stolen object justify opening every small container?	No. The permissible scope depends on the object sought and where probable cause supports finding it. United States v. Ross allows searching relevant vehicle areas and containers that could conceal the object, not places it could not fit. Collins v. Virginia adds a separate limit: the automobile exception alone does not authorize entering a home’s curtilage to reach a vehicle. Vehicle location and search scope are distinct questions.
9	Under Model Penal Code §2.02, how do purpose, knowledge, recklessness and negligence differ for a prohibited result?	Purpose means causing the result is the person’s conscious objective; knowledge means awareness that the result is practically certain. Recklessness means consciously disregarding a substantial, unjustifiable risk; negligence means failing to perceive such a risk when one should. The latter two require a gross deviation from the relevant standard, not ordinary civil carelessness. Apply the mental state to each statutory element: definitions for circumstances and conduct are not identical to those for results.
10	Why is “not free to leave” alone an incomplete Miranda custody test, and what counts as interrogation?	Howes requires assessment of the circumstances and coercive pressures associated with custodial questioning; an ordinary traffic stop can restrict movement without being Miranda custody. Under Innis, interrogation includes express questioning and its functional equivalent: conduct police should know is reasonably likely to elicit an incriminating response, excluding conduct normally attendant to arrest and custody. The inquiry is not limited to sentences ending in a question mark.
11	Under federal Pinkerton liability, is a conspirator automatically responsible for every crime another member commits?	No. The substantive offense must fall within the conspiracy’s scope, further its objectives and be reasonably foreseeable as a consequence of the unlawful agreement while the defendant remains a member. A separate personal crime does not become attributable merely because its perpetrator also joined the conspiracy. Effective withdrawal and timing matter; mere nonparticipation in the particular act is not itself withdrawal.
12	What must prosecutors disclose under Brady, and how does Kyles affect materiality?	They must disclose favorable evidence, including exculpatory and impeachment evidence, when it is material to guilt or punishment. Materiality is assessed cumulatively, not by dismissing each withheld item in isolation. Kyles requires the prosecutor to learn of favorable evidence known to others acting for the government in the case, including police. Bad faith and a defense request are not prerequisites. Constitutional Brady duties are not identical to a complete open-file policy; other disclosure duties may be broader.
13	Does California implied-malice murder require an intent to kill?	No. CALCRIM 520 requires an intentional act whose natural and probable consequences are dangerous to human life, knowledge of that danger, and deliberate action with conscious disregard for human life, together with the other murder elements. This subjective awareness distinguishes implied malice from criminal negligence. Malice does not require hatred of the victim, and awareness of a minor risk of injury alone is insufficient.
14	Do all federal conspiracy offenses require proof of an overt act?	No. The general conspiracy statute, 18 U.S.C. §371, requires an act by a conspirator to advance the agreement. By contrast, United States v. Shabani holds that a drug conspiracy under 21 U.S.C. §846 does not require an overt act. Read the particular statute rather than importing one conspiracy formula into every charge. An agreement alone also does not establish every other required element.
15	What standard did Case v. Montana reaffirm for emergency-aid entry into a home in January 2026?	Officers need an objectively reasonable basis for believing an occupant is seriously injured or imminently threatened with such injury. The Court rejected importing the criminal-investigation probable-cause standard and did not adopt Terry’s reasonable-suspicion test either. General community-caretaking concerns are not an open-ended license to enter a home. The emergency-aid justification must actually fit the circumstances.
16	How does New York’s retreat rule differ from California’s in deadly self-defense?	Under New York §35.15(2)(a), a person responding to deadly force must retreat when they know they can avoid using deadly force with complete personal safety to themselves and others. An exception applies in their dwelling if they were not the initial aggressor. California generally imposes no retreat requirement for otherwise lawful self-defense. Neither rule makes excessive force or an unjustified attack lawful; apply the specific statutory branch and exceptions.
17	How do independent source, inevitable discovery, attenuation and warrant good faith differ?	Independent source requires a genuinely separate lawful acquisition; inevitable discovery requires proof by a preponderance of the evidence that lawful means would have found it. Attenuation examines whether the connection to misconduct has sufficiently weakened, including time, intervening events and the misconduct’s purpose and flagrancy. Leon good faith concerns objectively reasonable warrant reliance, with limits for misleading affidavits, abandoned neutrality and plainly deficient support or warrants. These doctrines concern exclusion; they do not retroactively legalize misconduct.
18	How can California voluntary manslaughter differ from murder and involuntary manslaughter?	A killing otherwise amounting to murder may be reduced by legally sufficient heat of passion or imperfect self-defense. Being angry alone is insufficient: heat of passion includes an objective provocation requirement. Imperfect self-defense involves specified actual but unreasonable beliefs about imminent death or great bodily injury and immediate deadly force. Involuntary manslaughter instead involves an unlawful killing without intent to kill or conscious disregard for life, with the required criminal negligence. Not every accidental death is criminal.
19	Under California CALCRIM 505, must an imminent threat actually exist for deadly self-defense to be justified?	Not necessarily. The defendant must actually and reasonably believe in imminent danger of death or great bodily injury and that immediate deadly force is necessary, and must use no more force than reasonably necessary. A reasonable mistake about the danger can therefore qualify. Fear of possible future harm is insufficient. Aggressor and other applicable limitations must still be considered.
20	In Pennsylvania, how do duress and necessity differ?	Section 309 duress concerns unlawful force or threats that a person of reasonable firmness in the situation could not resist. Section 503 necessity concerns a reasonably believed need to avoid a greater harm, subject to statutory limits and legislative exclusions. Necessity is not restricted to natural disasters. Recklessly or negligently creating the predicament can restrict either defense under the applicable provision; do not assume every emergency excuses an offense.
21	When do Miranda safeguards apply, and what does the public-safety exception cover?	They apply to custodial interrogation, not every conversation with police or every arrest regardless of questioning. Volunteered statements are not interrogation merely because officers hear them. Quarles recognizes a narrow exception for questions reasonably prompted by an immediate public-safety concern, such as locating an abandoned gun. It is not a general exception for questions useful to solving a crime, nor permission to compel an answer.
22	For California felony murder, why are participation in the felony and an intent to kill not always enough under §189(e)?	Section 189(e) requires actual-killer status; assistance to the actual killer in first-degree murder with intent to kill; or major participation in the felony with reckless indifference to human life. In People v. Morris (May 2026), the court held that the intentional-assistance route requires aiding the lethal act itself, not just the underlying felony. Section 189(f) separately excepts specified killings of an on-duty peace officer whose status the defendant knew or reasonably should have known.
23	Why does a lawful Terry stop not automatically authorize a frisk?	An investigative stop requires reasonable, articulable suspicion of criminal activity; a protective frisk needs a reasonable basis to believe the person is armed and presently dangerous. The frisk is limited to finding weapons for safety, rather than a general evidence search. An officer cannot justify every frisk merely by saying the stop itself was lawful. Scope and the facts supporting each intrusion must be assessed separately.
24	How do requests for silence and counsel differ during custodial questioning?	A request for silence must be scrupulously honored; Mosley does not create a universal waiting-period rule. A clear counsel request triggers Edwards: police generally cannot reinitiate custodial questioning without counsel present, unless the suspect initiates and validly waives the right. Shatzer permits reapproach after at least 14 days outside Miranda custody, followed by a valid waiver. Fourteen days of uninterrupted custody is not that break.
25	Does an arrest automatically permit a search of the arrestee’s car and smartphone?	No. Gant permits a vehicle search incident to arrest when the arrestee is unsecured and within reaching distance of the passenger compartment, or when it is reasonable to believe it contains evidence of the arrest offense. Riley generally requires a warrant to search a phone’s digital contents despite a lawful arrest. A separately established exception may apply; arrest alone does not remove these limits.
26	What does federal solicitation under 18 U.S.C. §373 require, and is changing one’s mind enough to renounce it?	It requires intent that another commit a qualifying federal felony involving force, an effort to persuade or induce that conduct, and circumstances strongly corroborating the intent. The solicited crime need not be completed. The statutory renunciation defense requires voluntary, complete renunciation and prevention of the solicited crime; merely postponing it or changing victims is insufficient. Do not treat §373 as a statute covering solicitation of every possible offense.
27	Under Strickland, does an attorney’s mistake automatically establish ineffective assistance?	No. The ordinary test requires performance below objective professional standards and resulting prejudice. Review is deferential to reasonable professional judgments, rather than hindsight alone. Prejudice means a reasonable probability of a different result sufficient to undermine confidence in the outcome, not proof that a different result was more likely than not. An unfavorable outcome or a harmless mistake alone is insufficient.
28	What must accompany an officer’s plain-view observation before it justifies seizure?	The officer must lawfully occupy the viewing position, have lawful access to the item, and have probable cause to recognize its incriminating character. Seeing something from a public sidewalk does not itself permit entering a home to seize it. Horton rejects inadvertent discovery as an essential requirement. Plain view is a bounded seizure doctrine, not permission to conduct any additional search needed to establish suspicion.
29	Under Pennsylvania §301, when can an omission support criminal liability?	Liability normally requires conduct that includes a voluntary act, or an omission to perform an act the person was physically capable of performing. An omission is sufficient only when the offense expressly makes it sufficient or another law imposes the duty to act. A mere moral expectation to help is not automatically a legal duty. Identify the duty, ability to act and remaining offense elements.
30	Why is “voluntary intoxication defeats every specific-intent charge” an unsafe rule?	The jurisdiction and statute control; the label alone does not decide admissibility or the defense. Pennsylvania §308 generally excludes voluntary intoxication or a voluntary drugged condition as a defense or means of negating intent, but allows relevant evidence to reduce murder from a higher to a lower degree. That is not a general acquittal rule. Other jurisdictions use different approaches, and involuntary intoxication raises separate questions.
31	Why does Cheek not establish that any claimed ignorance of law excuses a federal tax offense?	For the willfulness requirement at issue, a genuinely held misunderstanding of the tax duty can negate deliberate violation of a known legal duty, even if objectively unreasonable. The jury still decides whether the belief was genuinely held; implausibility can bear on credibility. Knowing the duty but believing the tax law unconstitutional is different and does not negate willfulness. This holding is not a general defense to every crime.
32	How do Blockburger and the separate-sovereigns rule affect double-jeopardy analysis?	Blockburger compares statutory elements: whether each offense requires proof of something the other does not. Different labels or overlapping trial evidence alone do not answer that question. Gamble preserves the separate-sovereigns rule, so federal and state prosecutions can concern distinct sovereign offenses despite the same conduct. Two agencies of the same sovereign are not automatically separate sovereigns. The procedural posture and governing punishment rules still matter.