The Three-Part Test

The Three-Part Test

Model Penal Code § 3.05(1) makes force upon or toward another person justifiable to protect a third person when three listed conditions are present, and it opens by making that grant subject to the rest of § 3.05 and to § 3.09.¹ The three conditions are joined by and, so they are cumulative: the actor needs all three, and the failure of any one defeats the justification.² The reference to the rest of § 3.05 and to § 3.09 marks this test as a baseline. The retreat rules and the limits on faulty beliefs adjust it, and later sections of this chapter take those up in turn.

Each condition asks a different question about a different person or mental state. Condition (a) borrows the self-defense standard of § 3.04 and applies it to the injury the actor believes is threatened to the person he wants to protect, so the actor asks whether he would be justified in using this force if that injury were aimed at him.³ Condition (b) turns to the protected person and asks whether that person would be justified in using protective force, judged on the circumstances as the actor believes them to be.⁴ Condition (c) looks at the actor alone and requires that he believe his own intervention is necessary for the protection of the other person.⁵ Because all three must be satisfied, the test is best run as a checklist, one condition at a time.

The conditions are drafted this way because each one guards against a different failure. The first keeps third-party force from becoming a way around the limits on self-defense. Section 3.04, for example, withholds deadly force unless the actor believes it is necessary against death, serious bodily harm, kidnapping, or sexual intercourse compelled by force or threat, and by importing that standard the Code ensures that a rescuer cannot use deadly force against a threat that would not justify it in the rescuer's own defense.⁷ The second keeps the justification derivative, since a rescuer should not be able to do for another what that person could not lawfully do, but it measures the protected person's position by the rescuer's beliefs, which is the Code's answer to the mistaken rescuer whom the act-at-peril rule left exposed.⁸ The third keeps out force used for revenge or to exploit someone else's quarrel, because a person who strikes for his own reasons during a rescue is protecting no one.

The pair of scenes isolates the variable. The danger, the identity of the woman, and the kind of force are the same in both, and the answer moves only because of the stranger's own belief about whether intervention is needed, which is the one thing condition (c) examines. That is why the third condition cannot be folded into the other two: the first two concern the force and the protected person's position, and a rescuer can satisfy both while acting for reasons of his own. The prevailing common-law formulation reaches a similar place by asking whether the defender believes that the other person faces immediate unlawful bodily harm and that force is necessary to avoid it.⁹ The Code splits that single inquiry into three separate conditions, each framed around what the actor believes.

On an exam, the usual error is to treat the three conditions as alternatives, or to stop the analysis once the protected person is shown to have been an innocent victim. A stem that satisfies conditions (a) and (b) vividly often conceals a failure of condition (c) in a small detail, such as a threat that has already ended or a motive of anger. The three sections that follow take each condition in turn, beginning with the protector's own justification.

Protector's Own Justification

The first condition in § 3.05(1) asks whether the actor would be justified under § 3.04 in using such force to protect himself against the injury he believes to be threatened to the person he seeks to protect.¹¹ It works as a substitution exercise. The actor takes the threat as he perceives it, imagines that the same threat were aimed at him instead of at the other person, and asks whether the self-defense provision would permit the force he used. If it would, condition (a) is met. If it would not, the justification fails at the first step, however sympathetic the rescue looks. The condition is built around the injury the actor believes is threatened, so the inquiry starts from the scene as it appeared to the rescuer in the moment. That wording belongs to the same belief-centered drafting that displaced the act-at-peril rule, since a rescuer decides in seconds on appearances and has no chance to verify the facts first.

A substitution is only as demanding as the standard being substituted, so the content of § 3.04 matters. Section 3.04(1) makes force justifiable when the actor believes it is immediately necessary to protect himself against the use of unlawful force by the other person on the present occasion.¹² Section 3.04(2)(b) then sets a higher bar for deadly force, which is unavailable unless the actor believes it is necessary to protect himself against death, serious bodily harm, kidnapping, or sexual intercourse compelled by force or threat.¹³ The self-defense reading treats those rules in full, so two of their consequences are enough here: the force must be needed on the present occasion, and deadly force requires a believed threat of one of those grave kinds. The retreat and surrender limits in § 3.04(2)(b)(ii) also travel into the substitution, but § 3.05(2) adjusts them for rescues, and a later section of this chapter takes them up.¹⁴

Each borrowed limit does its own work. Borrowing the self-defense standard keeps protective force on the same footing as personal defense. If the standard were looser for others, a person facing an affront too small to justify force in his own defense could invoke a bystander's interest and escalate, and defense of others would become a route to force that self-defense forbids. The deadly-force threshold keeps the gravest force for the gravest harms, so a rescuer who believes only a minor threat exists cannot answer with a weapon. The immediacy requirement does different work: it confines force to the moment the harm is at hand, because a threat that lies days away leaves time for warning, flight, or the police, and force used early answers a danger that may never arrive. Both limits are measured by what the actor believes, since the rescuer acts on appearances.

The immediacy limit has a concrete illustration in Henley v. State, 493 S.W.3d 77 (Tex. Crim. App. 2016), which applied Texas Penal Code § 9.33. That statute justifies force to protect a third person when, under the circumstances as the actor reasonably believes them to be, the actor would be justified in using force to protect himself against the unlawful force he reasonably believes threatens the third person, and the actor reasonably believes his intervention is "immediately necessary."¹⁵ Because the statute does not define that phrase, the court gave it its plain meaning, borrowing the definition of "imminent" from the necessity defense: harm that is ready to take place and near at hand.¹⁶ Force is therefore immediately necessary when it is needed at that moment, when the decision must be made in a split second.¹⁷ Henley illustrates what immediacy means under a parallel Texas statute and does not interpret the Code. One difference is worth holding onto: the Texas statute asks for a reasonable belief, while § 3.04 is framed in terms of the actor's belief, and the Code handles an unreasonable belief through § 3.09(2), which a later section takes up.¹⁸

The two scenes differ only in the injury the passerby believes is threatened, and that single fact moves the answer, which is exactly what the substitution is designed to measure. The same exercise exposes a failure of timing.

On an exam, the usual loss comes from skipping the deadly-force threshold, because a rescue feels heroic and the other person's danger feels vivid. Condition (a) asks about the actor's own position under § 3.04 and says nothing about the protected person's position, which is the subject of condition (b) in the next section. A stem in which a protector uses a gun against a believed minor threat fails at this step even if every later condition is met, since the three conditions are cumulative.

Protected Person's Justification

Condition (a) asked about the rescuer's own position under the self-defense provision. Condition (b) turns to the person being protected and requires that, under the circumstances as the actor believes them to be, that person would be justified in using such protective force.²⁰ The phrase "as the actor believes them to be" sets the yardstick.²¹ A rescuer who misreads who started a fight, or who is making an arrest, carries that misreading into the analysis, so the protected person's position is measured against the scene as the rescuer pictured it and not against the facts as they later turn out. The word "such" ties the inquiry to the force the actor actually used, so the person protected must be someone who, on the actor's picture, could lawfully have used that much force.

The phrase exists to answer a problem the common law left unsolved. Under the act-at-peril rule, a rescuer could use force for another only if that person could lawfully have used it, so the rescuer's liability depended on facts he had no chance to check when he acted.²² In People v. Young a bystander intervened in good faith in a struggle between a third person and a police officer in civilian dress who was lawfully arresting that person, and the question was whether he could properly be convicted of assault. The New York Court of Appeals refused to exonerate him, reasoning that the right to defend another ordinarily should be no greater than that person's own right to defend himself.²³ A minority of jurisdictions still reason this way, but most now protect a rescuer who acts on appearances even when the person aided had no right of self-defense.²⁴ Section 3.05(1)(b) is the Code's version of the majority position. In State v. Mayo, a New Hampshire decision applying that state's own statute, the court rejected a jury instruction that would have barred a defense-of-a-third-person claim if the defendant's cousin was in fact the initial aggressor, whether or not the defendant knew or should have known it. The court reasoned that the instruction imported the old alter-ego rule into a statute that asks what the defendant reasonably believed, and it noted that the Model Penal Code's position was a large part of the reason many jurisdictions abandoned that rule.²⁵

The reason for measuring the protected person's position by the rescuer's picture comes from the rescuer's situation. A rescuer usually arrives in the middle of a scene, decides in seconds, and cannot confirm who started the quarrel or whether a plainclothes stranger is an officer. If the justification depended on the facts as they later emerge, the rescuer would in effect guarantee a stranger's legal position, and anyone weighing whether to step in would have reason to stay out. The assault and homicide offenses also require fault, so imposing liability for a mistake the rescuer could not have detected would punish a person who is not culpable.²⁶ The act-at-peril rule did have a defender's argument, that it keeps bystanders from hampering plainclothes officers.²⁷ The Code answers that concern differently, by denying force against an arrest the actor knows a peace officer is making, a limit that appears below.

The same misreading that sank the rescuer under act-at-peril can satisfy condition (b). Sir Galahad rounds a corner, sees Goliath swinging at David, and punches Goliath, not knowing that David had just reached for a knife and that Goliath's blow was itself privileged self-defense.²⁸ Under the shoe-stepping approach Galahad is exposed, because David had no right to resist a defensive blow. Under § 3.05(1)(b) the question is whether David would be justified on the facts Galahad believes, and on Galahad's picture David is the innocent target of an unprovoked swing, so the condition is met. Lancelot presents the mirror image: he comes upon the fight, concludes that David is the aggressor, and intervenes for Goliath, who in fact started the quarrel.²⁹ On the view Lancelot holds, Goliath is an innocent victim, so Goliath would be justified in using protective force and condition (b) is satisfied. The Young facts resolve the same way: a bystander who sees a plainclothes officer struggling with a stranger and believes the stranger is being unlawfully beaten satisfies condition (b), because on that belief the stranger would be justified in resisting.

Belief also works in the other direction, because condition (b) asks what the protected person would be entitled to do on the rescuer's own picture of the facts. If Lancelot knows that Goliath started the encounter with the purpose of causing serious injury, and Lancelot uses deadly force on Goliath's behalf, then on Lancelot's view Goliath would not be justified in using deadly force. Section 3.04 withholds deadly force from a person who, with the purpose of causing death or serious bodily injury, provoked the use of force against himself in the same encounter.³⁰ Condition (b) fails even though Goliath is the one being attacked. A known arrest produces the same result.

The actual arrest is the same in both scenes, and the answer moves only because the bystander's belief about who the officer is has changed. That is what the test is built to measure. Satisfying condition (b) does not complete the defense, though, because conditions (a) and (c) still have to be met. A careless reading of the scene is also a separate problem, because the Code removes the justification against prosecutions based on recklessness or negligence when the actor was reckless or negligent in forming the belief or in failing to acquire material knowledge.³² The next sections of this chapter take up that limit.

A caution about vocabulary belongs here. Common-law formulations and many state statutes ask whether the rescuer reasonably believed the other person was in immediate danger, and the modern rule is often called the reasonable-belief rule.³³ Condition (b) says only that the actor believes, so the Code controls careless beliefs through § 3.09 and not by adding a reasonableness requirement to this condition.

On an exam, the usual error is testing the protected person's justification against the real facts. A stem will often reveal at the end that the person aided was the aggressor, or that the stranger was an undercover officer, and tempt the reader to declare condition (b) failed. The right move is to ask what the rescuer believed, because a mistaken belief that the person was an innocent victim satisfies this condition. It also helps to avoid writing that condition (b) requires a reasonable belief, since the text says only that the actor believes.

Belief in Necessity

Conditions (a) and (b) measure the force against the self-defense standard, first from the rescuer's own position and then from the position of the person protected. Condition (c) turns to the rescuer's own mind. It requires that the actor believes that his intervention is necessary for the protection of the other person.³⁵ The condition therefore asks two things about the actor: whether he held that belief when he used force, and whether the force was a response to it. A rescuer who believes nothing needs doing, or who uses a stranger's danger as cover for some other purpose, does not satisfy it.

The reason for the condition comes from what the justification is for. The privilege to use force on another's behalf exists to protect that person, so it should reach only force used to that end. Without condition (c), a person who happened to see a third party in real danger could use the occasion to settle a score of his own and still claim the justification, because a scene can look justified on its face while the actor's real reason for striking lies elsewhere. The condition also keeps the privilege from outliving the danger. Once the actor no longer believes that force is needed to protect the other person, the purpose that supports the privilege is gone, and further force has nothing protective to rest on.

The wording is spare, and what it leaves out matters as much as what it says. The operative verb is believes, no reasonableness qualifier appears, and the word "immediately" does not occur in the condition itself. The phrase "his intervention" points the belief at the actor's own involvement, so an actor who thinks the danger has passed, or that someone else is already handling it, lacks the belief.³⁶ The phrase "necessary for the protection of such other person" names the purpose the belief must serve.³⁷

The common-law version of defense of others is built like self-defense, with an imminence requirement, a necessity requirement, and a proportionality requirement, and it asks that the defendant's belief be honest and reasonable.³⁸ Condition (c) asks only that the actor believe. A careless belief does not escape scrutiny, because the Code handles it separately through § 3.09(2), under which an actor who is reckless or negligent in having a belief about the necessity of force loses the justification against prosecutions based on recklessness or negligence.³⁹ A rescuer who sincerely but carelessly believed that intervention was necessary therefore satisfies condition (c) and may still be convicted of an offense that requires only recklessness or negligence, a route a later section takes up.

Courts applying third-person defense statutes tend to speak of necessity and timing together. In Henley v. State the Texas Court of Criminal Appeals read a statute that requires a reasonable belief that intervention is "immediately necessary" to protect a third person. Because the statute did not define the phrase, the court borrowed the definition of "imminent" from the necessity defense, so that force is immediately necessary when it is needed at that moment.⁴⁰ Henley construes a Texas statute and not the Code, so its reading cannot decide what § 3.05(1)(c) means. Its use here is to show why force aimed at a danger the actor knows is days away is premature, since nothing needs to be done at that moment. The Code divides the work between two prongs. Immediacy enters through condition (a), because § 3.04 asks whether force is immediately necessary on the present occasion, and condition (c) adds the actor's own belief that his intervention is needed to protect the other person.

The two scenes differ in one fact, the actor's belief about whether anything more must be done to protect the stranger, and that fact moves the answer. The grudge is not what defeats condition (c). The text speaks only of belief, so a bystander who resents the attacker but sincerely believes the choke is still in place and a blow is needed has satisfied it, whatever satisfaction he takes in landing the blow. What defeats the condition is the missing belief, which is why a pretext fails: an actor who claims to have been protecting someone does not in fact hold the belief the claim requires. Because the inquiry is about belief, actual necessity is not required either. A bystander who wrongly believes that the hold is still in place satisfies condition (c), and whether that belief was formed carelessly is a question for § 3.09 and not for this condition.

On an exam, the usual error is treating real danger to the other person as enough. A stem may stress that the stranger really was in peril and that the actor really did step in, and the temptation is to stop there. Condition (c) asks what the actor believed about the need for his own intervention, so a revenge motive, a retreating attacker, or the actor's remark that he thought the situation was handled is evidence on this condition. A second slip is to write that condition (c) requires a reasonable belief that intervention is immediately necessary. That is the Texas formulation in Henley and not the Code's wording, and under the Code the timing question belongs to condition (a) while careless belief belongs to § 3.09.