A citizen’s arrest in Arizona is lawful in only two situations: when a person commits a felony or a breach-of-peace misdemeanor in your presence, or when a felony has actually been committed and you have reasonable grounds to believe the person you’re detaining did it.1Arizona Legislature. Arizona Revised Statutes 13-3884 – Arrest by Private Person Step outside those boundaries and the person you grabbed can have you charged with unlawful imprisonment, a class 6 felony, plus whatever assault charges your use of force earns.
The Two Situations Where You Can Arrest
Arizona Revised Statutes 13-3884 is short and specific. A private person may arrest another either for a crime committed in their presence, or when a felony has in fact been committed and there are reasonable grounds to believe the arrestee committed it.1Arizona Legislature. Arizona Revised Statutes 13-3884 – Arrest by Private Person
These two prongs carry very different risks. When you witness the crime, your own observation settles whether it happened. The second prong is where citizen’s arrests go wrong. Your legal protection depends on the felony having actually occurred. Good faith does not save you if you were mistaken about that. “Reasonable grounds” means concrete facts tying both the crime and the specific person together, closer to what police call probable cause than to a hunch or a secondhand report.
Why Most Misdemeanors Don’t Qualify
You cannot make a citizen’s arrest for just any misdemeanor you see. The statute limits misdemeanor arrests to offenses amounting to a breach of the peace, meaning conduct that disturbs public order or threatens physical harm, such as a fight, disorderly conduct, or criminal threats. Quiet offenses like petty theft, trespassing without confrontation, or passing a bad check generally do not qualify.
This is the line most often misunderstood. Tackle someone you saw slip merchandise into a pocket and you have potentially committed assault and unlawful imprisonment over a misdemeanor that was never a breach of the peace to begin with. Shoplifting has its own detention rules under a separate statute, discussed below. For anyone who isn’t a merchant handling a suspected shoplifter, the breach-of-peace requirement eliminates most everyday misdemeanor situations from your authority.
Telling the Person Why
Arizona law requires you to state your intention to arrest and the reason for it, either before or during the detention.2Arizona Legislature. Arizona Code 13-3889 – Method of Arrest by Private Person The notification can be skipped if the person is actively committing the offense, is fleeing right after it, resists before you can speak, or if pausing to explain would let them escape.
Something as plain as “I’m detaining you because I saw you assault that person” clears the bar. The point is that the person understands they’re being held by a private citizen and knows the alleged reason. Skipping the explanation without meeting one of the statutory exceptions can undermine the legality of the whole arrest.
How Much Force You Can Use
A private person making a lawful arrest may use physical force, but only the amount reasonably necessary to carry out the detention.3Arizona Legislature. Arizona Code 13-409 – Justification, Use of Physical Force in Law Enforcement What’s reasonable is judged by what the situation actually required, not what it felt like at the time. A person who submits without resistance should get no more than a guiding hand. A person who struggles can be restrained in proportion, but anything beyond what the resistance demands crosses the line.
Deadly Force Is Narrower for You Than for Police
Arizona draws a sharp line between peace officers and private citizens on deadly force. A private citizen may use deadly force to effect an arrest only when the suspect is actually resisting with physical force or with the apparent ability to use deadly force.4Arizona Legislature. Arizona Revised Statutes Title 13 Criminal Code 13-410 A fleeing felon who poses no immediate physical threat does not give a private citizen justification for deadly force, even in a scenario where a peace officer might have broader authority.
When Your Force Becomes a Crime
Force beyond what the situation requires turns the arresting citizen into the one committing a crime. Intentionally or knowingly causing physical injury is a class 1 misdemeanor assault. Recklessly causing injury is a class 2 misdemeanor.5Arizona Legislature. Arizona Code 13-1203 – Assault, Classification Serious injuries or a weapon push the charge up to aggravated assault, a felony. Believing you were making a lawful arrest does not automatically justify the force you used.
What You Have to Do Next
Once you’ve detained someone, you must transfer them to the justice system without unnecessary delay. The two options are to take the person before the nearest magistrate in the county where the arrest took place, or to hand them over to a peace officer.6Arizona Legislature. Arizona Code 13-3900 – Duty of Private Person After Making Arrest In practice that means calling 911 and waiting for police.
“Without unnecessary delay” is doing real work in that statute. You are not entitled to question the person, search them beyond what’s needed for your own safety, or hold them while you investigate further. Every extra minute adds to your exposure, and if the arrest turns out to be unlawful, prolonged detention makes the consequences significantly worse.
Shoplifting Is Governed by a Different Statute
Merchants dealing with suspected shoplifters work under a separate authority. A store owner or employee with reasonable cause may detain a suspected shoplifter on the premises for a reasonable time and in a reasonable manner to question them or call law enforcement.7Arizona Legislature. Arizona Revised Statutes Title 13 Criminal Code 13-1805 This authority is broader than the general citizen’s arrest statute because shoplifting is typically not a breach of the peace, so the standard rule wouldn’t cover it. Reasonable cause is a defense against civil and criminal claims for false arrest, false imprisonment, and wrongful detention. “Reasonable” is the controlling word at every step. Chasing a suspect off the premises, using disproportionate force, or holding someone for hours all push past what the statute protects.
What Happens If You Get It Wrong
The most likely criminal charge after a citizen’s arrest that doesn’t hold up is unlawful imprisonment, which Arizona defines as knowingly restraining another person. It is a class 6 felony. One meaningful mitigation applies: if you voluntarily release the person in a safe place without physical injury before police arrive, the charge drops to a class 1 misdemeanor.8Arizona Legislature. Arizona Code 13-1303 – Unlawful Imprisonment, Classification, Definition
Excessive force during the detention adds assault charges on top, with classification tied to what you did and the harm caused.5Arizona Legislature. Arizona Code 13-1203 – Assault, Classification A weapon or serious physical injury pushes the case into aggravated assault territory, which carries prison time. A single bad decision can generate multiple counts.
Civil exposure runs alongside the criminal case. The person you detained can sue for false imprisonment, battery, and assault. Arizona does not cap damages in these cases, and a jury decides what your mistake cost in medical bills, lost wages, emotional distress, and potentially punitive damages for especially reckless conduct. Even when the arrest itself was technically lawful, excessive force during the detention supports a separate battery claim. Because you are a private individual rather than a government employee, none of the immunity doctrines that protect police apply, and every dollar of a judgment comes out of your own pocket.