Deadly Force Laws: Legal Justification for Self-Defense

Self-defense is an affirmative defense in criminal law, meaning the defendant bears the burden of producing some evidence from which a jury can find that self-defense applied. Once the defense presents this minimal burden, the burden of proof returns to the prosecution, which must disprove self-defense beyond a reasonable doubt—the highest standard in all of law. This differs from ordinary criminal defenses where the prosecution bears the burden throughout.

In criminal law, self-defense can function as an affirmative defense, meaning the defendant must prove their case rather than the prosecution disproving it. In Wisconsin, self-defense is an affirmative defense, which means the defendant must prove they acted in self-defense beyond a reasonable doubt. This is different from jurisdictions where self-defense is a negative defense, where the prosecution must disprove self-defense beyond a reasonable doubt. The distinction affects who bears the burden of proof in court.

Self-defense is an affirmative defense that must be proved beyond a reasonable doubt by the person claiming it. It is a fact-bound inquiry that depends on specific circumstances including provocation standards and duty to retreat requirements. The legal standard for self-defense varies by jurisdiction and requires careful analysis of the specific facts of each case.

Self-defense functions as an affirmative defense in criminal law, meaning the defendant must affirmatively prove that their actions were justified. Even if the defendant did not commit the physical act that caused harm, they may argue that their response was a legitimate self-defense reaction to being touched or threatened first. The burden of proof for self-defense typically rests on the defendant, who must demonstrate that their actions were reasonable and necessary under the circumstances.

Self-defense is an affirmative defense, which differs from general defenses. In general defenses, the burden of proof remains entirely with the prosecution. In affirmative defenses, the defendant acknowledges the act but claims legal justification. For self-defense, the defendant must prove by preponderance of evidence (more likely than not) that self-defense was justified. If the defense proves this, the burden shifts to the prosecution to disprove self-defense beyond a reasonable doubt.

Holmes constructs a standard for liability based on what a reasonably reasonable person would think and do in a given situation. This is not an ideal of a perfectly reasonable person but of an average of the community. What would a normal average reasonable person think and do in a given situation? This standard is used in both criminal law and civil law (torts) to determine liability. The court imagines this abstract person and uses that construct to determine what the ruling should be. The reasonable person standard is what is used in contemporary negligence law. If you do an act, the court will decide whether that act was negligent or not based on whether a reasonable person in your position would have done that act or failed to do that act. This calls upon the court to imagine what an idealized median person would behave under those circumstances and then decide whether you came up to that standard.

The reasonable person standard is a hypothetical legal concept used in tort and criminal law to determine liability by comparing an individual's actions against an imaginary person who exercises the average amount of care, judgment, and skill expected of someone in their society; originally called 'the man on the Clapham omnibus' from UK legal history, this standard can be ethically problematic when attorneys subjectively manipulate it to justify questionable behavior, as demonstrated through sexual harassment cases where the line between reasonable and unethical actions becomes blurred.

The reasonable person standard is used to determine whether a defendant should have known that their conduct could cause harm. If no reasonable person would believe that the conduct could stop a trial, then the defendant cannot be found to have reckless disregard for that risk. This standard protects speech that no reasonable person would think could interfere with legal proceedings.

Tort law generally applies an objective reasonable person standard when determining whether contact was harmful or offensive. Courts ask what a reasonable person would find offensive, not what the plaintiff subjectively felt. For example, a tap on the shoulder to ask directions would not be considered offensive by a reasonable person, so no liability exists even if the plaintiff was hypersensitive.

The reasonable person standard is a legal concept used to determine whether a defendant's conduct fell below what a hypothetical reasonable person would have done under similar circumstances. In criminal negligence cases, courts evaluate whether a reasonable person would have foreseen the risk of harm from the defendant's actions. This standard helps distinguish between ordinary negligence and criminal negligence.

Self-defense law categorizes force into two buckets: non-deadly force (force not likely to cause death or serious bodily injury) and deadly force (force that can cause death or serious bodily injury). Deadly force includes actions like using a knife, gun, or running someone over with a car. The law does not care what specific weapon or method is used, but rather whether the conditions for deadly force have been met. A maiming injury or broken bone qualifies as deadly force even if the victim would not have died from it.

Deadly force is defined as force that will foreseeably and reasonably create the likelihood of death or causing serious bodily harm (also known as great bodily harm), which includes injuries involving substantial risk of death, protracted disfigurement, protracted loss of physical function, or protracted loss of consciousness such as gunshot wounds, stabbings with deep penetration, broken bones, severe burns, and loss of limbs. Understanding this distinction is critical because misapplying deadly force when only non-deadly force was justified can result in serious criminal liability, as many individuals mistakenly believe their actions are less than lethal when they could foreseeably cause great bodily harm.

Proportionality requires matching defensive force to the threat level. Deadly force includes any force reasonably capable of causing death or serious bodily injury (broken bones, loss of bodily function, or death). Non-deadly force cannot readily cause such harm. The law requires proportional responses: non-deadly force against non-deadly threats, deadly force only against deadly threats. Vehicles can constitute deadly weapons when used to inflict death or serious bodily injury. The burden of proof rests on the state to disprove self-defense elements beyond reasonable doubt, not on the defendant to prove self-defense.

Deadly force is any force that can cause death or grave bodily injury. Non-deadly force is anything less. You can only use deadly force in response to a deadly force threat. A sustained beating that could cause grave bodily injury qualifies as a deadly force threat. People commonly get into trouble when they use deadly force against a non-deadly threat, such as using a gun against someone merely threatening to shove them. Statistics show you are five times more likely to be the victim of a non-deadly force attack than a deadly force attack. If your only self-defense tool is a gun, you may be forced to use deadly force against a non-deadly threat, making your use of force disproportionate and unlawful. Martial artists must understand that techniques causing grave bodily harm constitute deadly force, regardless of whether weapons are used.

Self-defense is divided into non-deadly and deadly force. Non-deadly force requires the actor to reasonably believe force is necessary to protect against imminent unlawful force, with no duty to retreat. Deadly force requires: (1) a threat of actual or apparent deadly force that is unlawful and imminent, (2) reasonable belief of imminent peril of death or serious bodily harm, and (3) reasonable belief that the response is necessary. The aggressor rule prevents those who incite violence from claiming self-defense, though they can regain rights by withdrawing. The majority rule allows standing ground, while the minority requires retreat if safe. The castle doctrine exempts retreat from one's home. The Model Penal Code uses a subjective belief test and imposes a duty to retreat except in one's home.