Defenses — Criminal Law & Constitutional Protections

Devon walks in on someone violently beating a loved one, and in a blind rage kills the attacker on the spot. The prosecution can prove all of it. Devon did the act. Devon meant to kill. On its face that is murder, and every element is there.

And Devon still does not go down for murder. Not because the state failed to prove something, but because the law recognizes a reason not to hold Devon fully to blame. That is what a defense is. This episode covers five, and what decides how each lands is usually one sentence in a statute the exam hands you.

Here is the route. First the four buckets a defense can fall into, because the bucket tells you the outcome. Then provocation, and the cooling time rules the outline spotlights. Then intoxication, voluntary and involuntary. Then self-defense, with retreat and the initial aggressor. And finally defense of others and of property.

Start with the categories, because the category tells you the consequence. Four buckets. A justification says the act was not wrongful at all under the circumstances. Self-defense, defense of others, and defense of property are justifications, and a successful one is a complete acquittal.

An excuse admits the act was wrong but says this defendant is not blameworthy. Involuntary intoxication works that way, much like insanity, and it also acquits completely. A failure of proof defense is not an affirmative defense at all. It negates an element the state must prove, and voluntary intoxication is the example.

And a partial defense does not acquit. It lowers the grade of the offense. Provocation is the classic one, and it is Devon's bucket. It knocks murder down to voluntary manslaughter and never sets the defendant free.

One more piece of framing. Defenses is an unstarred topic, so the exam will usually hand you the governing statute and ask you to apply it. The skill is careful reading, not blind recall. Mark which words are objective, like reasonable, and which are subjective, like believed.

Provocation first. A killing committed in a sudden rage, triggered by something that would push an ordinary person past self-control, has long been treated as less wicked than a cold, calculated one. Two things get missed constantly. It never produces an acquittal, and it applies only to homicide. There is no heat of passion discount for theft.

Four common law elements, in matched pairs. Adequate provocation, something that would make a reasonable person lose self-control, which is objective. Actual heat of passion, meaning this defendant was in fact enraged when they killed, which is subjective. No reasonable cooling-off time, objective. And no actual cooling off, subjective. Plus causation from provocation to passion to killing.

What clears the objective bar? A serious battery. A violent assault. Mutual combat. And catching a spouse in the act of adultery. Some jurisdictions add an unlawful arrest. What does not qualify is trivial batteries, injuries to property, and the most tested trap in this topic.

Mere words. Riley is screamed at with vicious insults and a degrading slur, picks up a tire iron, and kills on the spot. Murder, or manslaughter? Murder. Under the traditional mere words rule, insults are never adequate provocation, however cruel. Modern courts soften that only for informational words revealing a fact that would itself be adequate provocation. Plain name-calling fails.

Now cooling time, where the outline puts its spotlight. Even genuine provocation loses its force if enough time passes for a reasonable person to cool down. Kill after that window closes and it is murder again. Sam is badly beaten by a neighbor on Monday. By Wednesday Sam has calmed down, so killing out of lingering anger is murder.

But passion can be rekindled. Change those facts. On Wednesday the neighbor corners Sam, laughs about the beating, and shoves him again. That fresh taunt and shove can reignite the earlier rage, reopening the manslaughter option. A long, mounting course of abuse that finally boils over does the same. The question is whether, at the moment of the killing, a reasonable person would still be overwhelmed.

Some jurisdictions throw all of that out. The Model Penal Code replaces the rigid common law test with extreme mental or emotional disturbance for which there is a reasonable explanation. Reasonableness is judged from the viewpoint of a person in the defendant's situation. No fixed list of triggers. No cooling-time cutoff. No bar on words. And the disturbance need not come from the victim.

So read the statute and find out which test you are in. A Franklin Criminal Code provision reduces murder to voluntary manslaughter for a killing in a sudden heat of passion, arising from adequate provocation. It must come before a reasonable time for that passion to cool. Then it adds a sentence. Words alone do not constitute adequate provocation. Quinn, taunted with words only, kills the taunter. That sentence defeats the defense.

On to intoxication, where every problem turns on one threshold question. Was it voluntary or involuntary? The answer decides which crimes it can touch and whether it helps at all. Voluntary means the defendant knowingly drank or took drugs. That is a failure of proof argument, not an excuse. I was too impaired to form the mental state this crime requires.

Which is why voluntary intoxication reaches only a specific intent element, a crime demanding a particular purpose. Larceny's intent to permanently deprive. The premeditation of first-degree murder. It is no help against general intent crimes like battery, against malice crimes, or against strict liability offenses.

Two more rules on that side. Many states restrict or abolish the defense entirely, and the Supreme Court has held a state may constitutionally bar intoxication evidence offered to negate mental state. So check the provided statute. And under the Model Penal Code it is never a defense to recklessness. If a sober person would have seen the risk, being too drunk to notice it is itself reckless.

Involuntary intoxication is a different animal and a much broader shield. The defendant did not choose the condition, so the law does not blame them for it. It is treated like temporary insanity. It can be a complete defense to any crime, even strict liability, if it left the defendant unable to appreciate the act was wrong or to control their conduct.

So how does something count as involuntary? Three ways. Coerced, where the defendant was forced or tricked into ingesting it. Innocent mistake, like a spiked drink or a mislabeled pill. Or an unexpected, grossly excessive reaction to a prescribed medication taken as directed. Watch the contrast. Blake drinks heavily and drives off in someone else's car, and that may negate larceny's specific intent. Spike Blake's soda, and the same conduct gets a complete defense.

Self-defense is the classic justification. Using force to protect yourself from an attacker is not wrongful at all. A person may use force reasonably necessary to defend against what they reasonably believe to be an imminent and unlawful use of force. Two words carry the weight. Imminent means happening now or just about to. A past attack is revenge, a feared future one is pre-emption, and neither counts.

The second word is reasonable, and the belief must be both honestly held and objectively sensible. Which sets up a doctrine worth knowing by name. A defendant who honestly but unreasonably believes force was necessary has imperfect self-defense. In many states that does not acquit. It reduces murder to voluntary manslaughter, because the defendant was sincere but wrong.

Five elements, then. An imminent threat of unlawful force. An honest belief that force was necessary. That belief being objectively reasonable. Proportional force. And no initial aggression, or the right regained.

Proportionality is where most answers are won or lost. Non-deadly force may be used whenever reasonably necessary against imminent unlawful force, and there is generally no duty to retreat first. Deadly force is tightly limited. Only against an imminent threat of death or serious bodily harm, and in many jurisdictions to prevent a forcible felony like robbery.

So test the flip side. An unarmed man shoves you once, hard, and raises his fists. You draw a concealed pistol and shoot him in the chest. Self-defense, or not? Not. A bare-handed shove is a non-deadly threat, and answering it with lethal force is disproportionate. That forfeits the defense entirely.

The most litigated question is whether you must retreat before using deadly force, and jurisdictions split three ways. The modern majority, now the law in most states, is stand your ground. If you are not the aggressor and you are somewhere you may lawfully be, you have no duty to retreat, even if a safe escape was available. A minority keeps the older rule.

But note the limits on that minority rule. Retreat is required only before deadly force, never before non-deadly force, and only when escape is truly safe. Sitting on top of both is the castle doctrine. Even in a retreat state there is no duty to retreat from your own home, and many states extend the castle to the curtilage, the workplace, or an occupied vehicle.

Watch a statute decide it. The Columbia Penal Code bars deadly force if the defendant knows they can retreat with complete personal safety, except that there is no duty to retreat from their own dwelling. Jordan is threatened with a knife on a public street, could run to safety, and shoots instead. Jordan loses. Move that confrontation into Jordan's living room and the last clause flips it.

Last piece of self-defense. An initial aggressor normally cannot claim it, because you cannot start a fight and then plead defense when it turns against you. But the right comes back two ways. Withdrawal, where the aggressor completely stops and clearly communicates it, and the other person keeps attacking. Or sudden escalation. Alex throws a punch and the other person draws a knife. That is a fresh unlawful threat Alex may defend against.

Defense of others mirrors self-defense. You may use the same force to defend a third person that they could lawfully use themselves. Reasonable force against an imminent unlawful attack, deadly force limited to threats of death or serious harm. And modern law dropped the old requirement that the person be family or household. You may defend a total stranger.

The interesting problems arise when you guess wrong, and jurisdictions split. The majority, and the Model Penal Code, use a reasonable belief rule. You are justified if you reasonably believed the person you helped was entitled to defend themselves, even if that belief turns out wrong. The minority alter ego rule gives you exactly that person's rights.

Watch the split decide a case. Morgan sees a larger person pinning a smaller one who is yelling for help, and pulls the larger person off with reasonable non-deadly force. It emerges that the smaller one was a mugger and the larger person the innocent target fighting back. Under the majority rule Morgan is justified. Under the alter ego rule Morgan is liable, having stepped into a mugger's shoes.

Defense of property last, and the law values life far above possessions, so the force allowed is sharply limited. Reasonable non-deadly force to prevent or end an unlawful intrusion onto your land, or the unlawful taking of your property. Usually you must first make a request to desist, unless that would be dangerous or useless. And here is the headline. You may never use deadly force to protect property alone.

Which answers the spring gun. Blake rigs a loaded shotgun to the back door of an unoccupied cabin, and it kills an unarmed burglar while Blake is far away. Liable, or not? Liable. A mechanical device is judged as if the owner were present. You may use one only if you could have used that force in person.

Deadly force does become lawful under a related doctrine, defense of habitation, which protects an occupied home rather than mere things. The modern majority allows it to prevent a violent or forcible entry into an occupied dwelling that threatens the people inside. The justification is danger to the occupants, not the building.

Two related limits round it out. Recapture of chattels. If someone wrongfully takes your property you may use reasonable non-deadly force to get it back, but only in fresh pursuit, while chasing the taker down. Once time has passed the privilege is gone and you use the courts. A related privilege lets a shopkeeper detain a suspected shoplifter.

One last statute to read. The Olympia Revised Statutes allow reasonable force, other than deadly force, to prevent or terminate an unlawful entry or interference with property. Deadly force is permitted only to prevent a forcible and violent felony, or death or serious injury to an occupant of a dwelling. Casey tackles a trespasser wheeling a bicycle off the porch. Allowed. Casey shoots the fleeing thief. Forbidden.

One cross-cutting point before we finish. The defendant always carries the burden of production to get a defense in front of the jury. For justifications like self-defense, most jurisdictions then make the prosecution disprove it beyond a reasonable doubt. But a state may constitutionally put the burden of persuasion on the defendant.

A word on authorities, because this episode named no cases, and that is exactly right for this topic. Defenses is unstarred. The exam will hand you the governing statute and ask you to apply it, so nothing here rewards recall of a case name. What it rewards is finding the operative clause and testing the facts against it.

If you keep only three things, keep these. The four buckets, because they tell you whether a defense acquits, reduces the grade, or negates an element. The deadly force ceiling, because it is the same answer in three different places. And the line between voluntary and involuntary intoxication, because everything downstream turns on it.

Now the traps, straight from the examiners' favorites. One. Provocation never acquits. An answer choice that lets the defendant go free on heat of passion is wrong. Two. Mere words are not adequate provocation at common law, however vile, though the Model Penal Code test is more forgiving. Three. Do not give voluntary intoxication the insanity-like effect that belongs to involuntary intoxication.

Four. Voluntary intoxication drops first-degree murder to second-degree, not to manslaughter. Five. Deadly force is never allowed to protect property or possessions alone, and watch for spring gun facts, where the owner is liable as if present. Six. Do not assume a duty to retreat. The modern majority is stand your ground, and even retreat states never require retreat from the home.

Seven. An initial aggressor regains self-defense only by withdrawing and communicating it, or when the victim suddenly escalates to deadly force. And eight. Imminence. A past attack is revenge and a future one is pre-emption. Only a present threat supports self-defense.

Time for the quick check, and this one comes straight from the BARGO question bank. Heavily intoxicated after a long night of drinking, Morgan gets into a confrontation outside a nightclub, pulls a pistol, and shoots a man dead. Morgan is charged with first-degree murder, which in this jurisdiction requires premeditation and deliberation. The jury could find Morgan was far too drunk to have planned the killing.

If the jury finds the intoxication prevented premeditation, what is the effect? Option one. Acquittal, because the state cannot prove an essential element. Option two. Reduction to voluntary manslaughter, because passion is established. Option three. Reduction to second-degree murder, which needs no premeditation. Pause here if you want a moment.

The answer is option three. Voluntary intoxication can knock out the premeditation and deliberation that distinguish first-degree murder, dropping the offense to second-degree. But no further, because second-degree murder rests on malice, and malice does not require a clear, sober head. Option one fails because negating premeditation defeats only the grade, not the killing. Option two fails because intoxication is not heat of passion, and no adequate provocation appears in these facts.

That is the classic teaching point of the whole intoxication section, and worth drilling until it is automatic. There are thirty plus more questions on this topic alone, each with every option explained like that.

Five things to take away. One. Defenses sort into four buckets, and the bucket tells you the outcome. Acquittal, acquittal, a negated element, or a lower grade. Two. Provocation reduces murder to voluntary manslaughter and never acquits, mere words are never adequate at common law, and cooling time kills it unless passion was rekindled.

Three. Voluntary intoxication is failure of proof, reaching specific intent only, while involuntary intoxication excuses any crime. Four. Self-defense needs an imminent threat, an honest and reasonable belief, and proportional force, and the modern majority lets you stand your ground. Five. Deadly force never protects property alone.

Which is why Devon walks out of that courtroom convicted of something, just not of murder. Every element was there. The law refused to hold him fully to blame. Next time, Homicide.

Practice this topic with more than 2,900 exam-style questions, free to start, at nextgenbargo.com. This episode is for education and exam preparation only, not legal advice, and we are not affiliated with or endorsed by the NCBE or any bar examining authority.