Encounters, detentions and arrest
Consensual encounters, seizures, reasonable suspicion and tips, stop scope and length, frisks, identification, traffic stops, checkpoints, probable cause, arrest authority, de facto arrests, home arrests and prompt probable-cause review, under the Fourth Amendment, Supreme Court and Ninth Circuit authority and SAPC ch. 38.
Required for Class A Class B Class C Class D Class F
The exam draws 30 questions from a bank of 60. You have 45 minutes, and you need 80% to pass. Questions apply the law to situations. To prepare, read this guide alongside the cited sections of the San Andreas codes, the 2026 Law Enforcement Reform Package and the federal authorities below. The U.S. Constitution binds every San Andreas officer. Supreme Court decisions are binding; federal circuit decisions are accepted authority, and where circuits differ the academy teaches the rule that protects rights more.
Every police contact sits on one of three tiers, and the tier decides what you need. A consensual encounter needs no justification: you may approach anyone in a public place, ask questions, and ask to see identification, and the person may decline and walk away. Walking away is not an offense. A person is seized when, in view of all the circumstances, a reasonable person would not feel free to leave (United States v. Mendenhall). In a confined space such as a bus, where leaving is not practical, the test is whether a reasonable person would feel free to decline the officers' requests or otherwise end the encounter (Florida v. Bostick). Officers need not tell people they may refuse (United States v. Drayton). Things that turn an encounter into a seizure include blocking the person's path, keeping their identification, a command, a drawn weapon, a hand on the person or several officers surrounding them. The tier is judged objectively; your private intentions do not change it.
Two cases fix the moment a seizure happens. A show of authority, such as 'Stop, police!', is not a seizure until the person actually submits; a suspect who keeps running is not yet seized, and contraband he throws away while fleeing is not the fruit of a seizure (California v. Hodari D.). Physical force is different: applying force to the body with intent to restrain is a seizure at that moment, even if the person breaks free or drives away (Torres v. Madrid). So an officer who shoots or grabs a suspect has seized him, and that seizure must be reasonable, whether or not he escapes. Note the San Andreas offenses that depend on lawful police action. Failure to Stop for Investigative Detention (SAPC §38.16) requires an order from an officer who has reasonable suspicion. Evading Arrest on Foot (§38.05) and Evading in a Vehicle (§38.01) require an officer lawfully attempting to arrest or detain. If the stop itself was unlawful, those offenses are not made out.
An investigative detention, or Terry stop, requires reasonable suspicion: specific, articulable facts that, with rational inferences from them, would lead a reasonable officer to suspect that criminal activity is afoot (Terry v. Ohio). It is judged on the totality of the circumstances, including the inferences a trained officer draws that a layperson might miss (United States v. Cortez), and facts that are each consistent with innocence can together amount to reasonable suspicion (United States v. Sokolow). A hunch, a feeling that someone 'doesn't belong', or a person's race, age or appearance is not reasonable suspicion; a stop made primarily on race, ethnicity, age, national origin or gender is prohibited in San Andreas (SAPC §38.83) and violates equal protection. Unprovoked headlong flight on seeing police in a high-crime area can support reasonable suspicion, but presence in a high-crime area alone cannot (Illinois v. Wardlow). Declining to talk to an officer and walking away calmly is the exercise of a right, not flight. Unlawful presence in the country is not itself a crime, and it does not justify a stop or arrest by state officers (Melendres v. Arpaio).
Tips are judged by who gave them and what they show. A known informant who tells you face to face what he saw can supply reasonable suspicion, because he can be held accountable if he lies (Adams v. Williams). An anonymous tip can supply it when it accurately predicts future behavior and officers corroborate those predictions, because predictions show inside knowledge (Alabama v. White). A bare anonymous tip that a person is carrying a gun, with no predictive information and no corroboration, does not justify a stop and frisk (Florida v. J.L.). Confirming the description in such a tip, the clothing and the location that anyone could see, tells you whom the caller meant, not that the caller is right about the gun. A 911 caller's eyewitness report of being run off the road by a described vehicle can give reasonable suspicion of drunk driving, even if the officer who finds the vehicle sees no further bad driving (Navarette v. California). Record exactly what the tip said, how it came in and what you confirmed before acting.
A lawful stop can become unlawful by its scope or its length. An investigative detention must last no longer than necessary to carry out its purpose and must use the least intrusive means reasonably available (Florida v. Royer). There is no fixed time limit; a detention's length is reasonable when police diligently pursue a means of investigation likely to confirm or dispel their suspicion quickly (United States v. Sharpe). Luggage may be held briefly for a dog sniff on reasonable suspicion, but a 90-minute detention was too long (United States v. Place). A traffic stop's mission is the violation plus the ordinary checks: licence, warrants, registration and insurance. Police may not prolong a completed traffic stop, even briefly, for a dog sniff without independent reasonable suspicion (Rodriguez v. United States), and dragging out the paperwork to wait for a dog is the same thing in slow motion. A sniff by a dog already on scene that does not prolong the stop is not a search (Illinois v. Caballes). If reasonable suspicion of something else develops during the stop, articulate it and the new mission begins.
A detention does not by itself authorize a frisk. A frisk needs a separate reasonable belief that the person is armed and dangerous, and it is a pat-down of the outer clothing for weapons (Terry v. Ohio). Facts that support the belief include a reported weapon from a reliable source, a bulge consistent with a gun, furtive movements toward the waistband, or a suspected crime, such as armed robbery, that ordinarily involves a weapon. During a lawful frisk an officer may seize an object whose contraband nature is immediately apparent by touch, but may not squeeze, slide or manipulate an object already known not to be a weapon to find out what it is (Minnesota v. Dickerson). The passenger compartment of a car may be frisked for weapons, limited to places a weapon could be placed or hidden, on reasonable suspicion that the suspect is dangerous and may gain access to a weapon (Michigan v. Long). A passenger may be frisked during a lawful traffic stop on reasonable suspicion that the passenger is armed and dangerous (Arizona v. Johnson). A warrant to search premises does not allow frisking everyone present without individualized suspicion (Ybarra v. Illinois).
Identification has its own rules. A person may not be stopped and required to identify himself without reasonable suspicion (Brown v. Texas), so a demand for identification during a consensual encounter may be refused. A state may require a person lawfully detained on reasonable suspicion to state his name (Hiibel v. Sixth Judicial District Court). San Andreas makes it Failure to Identify to Law Enforcement (SAPC §38.08), a Class C Misdemeanor carrying citation and release, for a person who has been lawfully stopped to refuse intentionally to give name, date of birth and residence address. The statute requires the person to give the information; it does not say he must produce a card. Giving a false name, date of birth, address or identification document while lawfully detained or arrested is Concealment of Identity (§38.15), a Class A Misdemeanor. A fugitive from justice who refuses to identify after a lawful arrest commits §38.07, and a person lawfully detained as a witness who refuses to identify commits §38.17. Every one of these offenses rests on a lawful stop, detention or arrest. If the stop was unlawful, the refusal is not a crime.
A traffic stop is a seizure of everyone in the car. A stop supported by probable cause of a traffic violation is valid under the Fourth Amendment whatever the officer's subjective motive (Whren v. United States), but Whren does not make discrimination lawful: a stop made primarily because of race or another protected trait still violates SAPC §38.83 and equal protection. A reasonable mistake of law, such as a sensible reading of an ambiguous equipment statute that a court later rejects, can support reasonable suspicion (Heien v. North Carolina); an unreasonable misreading cannot. Random, suspicionless stops to check licence and registration are unreasonable (Delaware v. Prouse). Absent contrary information, an officer may infer that a car's registered owner, whose licence is revoked, is the one driving (Kansas v. Glover); if you can see that the driver plainly is not the owner, the inference is gone. You may order the driver out (Pennsylvania v. Mimms) and the passengers out (Maryland v. Wilson) of a lawfully stopped car without further justification. Because a passenger is seized too, a passenger may challenge the legality of the stop (Brendlin v. California).
Checkpoints are the narrow exception to individualized suspicion, and their legality turns on their primary purpose. Properly conducted sobriety checkpoints are reasonable (Michigan Department of State Police v. Sitz): they are set up under a supervisor's plan, every vehicle or a neutral sequence is stopped, the stop is brief, and officers have no discretion to choose whom to stop. A checkpoint whose primary purpose is general crime control, such as finding drugs, is unconstitutional (City of Indianapolis v. Edmond); adding a drug dog to a 'licence check' to search for narcotics is the Edmond problem. A brief information-seeking checkpoint asking motorists for help about a recent crime can be reasonable (Illinois v. Lidster). Stops for completed offenses deserve care. In the Ninth Circuit's rule, whether a stop for a completed misdemeanor is reasonable depends on the public-safety risk the offense poses, and a minor completed offense may not justify a stop at all (United States v. Grigg). An ongoing violation in front of you is a different matter.
An arrest requires probable cause: a fair probability, judged on the totality of the circumstances, that the person committed an offense (Illinois v. Gates). A tip's veracity, reliability and basis of knowledge are weighed together, not as a rigid checklist. Probable cause looks at the whole picture and the reasonable inferences from it, not at each fact in isolation; an innocent explanation is weighed as part of that picture and does not automatically defeat probable cause (District of Columbia v. Wesby). Drugs found where every occupant of a car had access can give probable cause to arrest each occupant (Maryland v. Pringle). An arrest is lawful if the facts known to the officer gave probable cause for any offense, even one the officer did not name at the time (Devenpeck v. Alford), though your report must still say truthfully what you knew. An officer who intentionally arrests without probable cause, arrests knowing the charges are false, or detains a person beyond the legally authorized period without charge commits Unlawful Arrest (SAPC §38.80), a State Jail Felony; a good-faith arrest on facts that later prove wrong is not that offense. Fabricating probable cause in a report or affidavit is §38.81.
The Fourth Amendment allows a custodial arrest for a minor offense committed in the officer's presence, even one punishable only by a fine (Atwater v. City of Lago Vista), and an arrest on probable cause does not violate the Fourth Amendment merely because state law forbade it (Virginia v. Moore). Neither case lets a San Andreas officer ignore the code. Each code section states its arrest authority: 'Mandatory custodial arrest' means the person must be taken into custody once probable cause exists; 'Discretionary custodial arrest' lets the officer choose custody or a citation; 'Citation and release (custodial arrest only on aggravating circumstance)' makes a citation the default; 'Civil citation; no custodial arrest' gives no power to arrest for that violation. Moore means a court will not suppress evidence under the Fourth Amendment for that reason alone; it does not excuse breaking state law or agency policy. Authority also depends on jurisdiction (Act I §1.12): outside primary territory you act only on a lawful basis such as fresh pursuit, with notice to the agency with jurisdiction (Act VII §7.03, §7.04). Using force against an officer to prevent an arrest, search or transport is Resisting Arrest (SAPC §38.04).
Labels do not decide whether a person is under arrest; the degree of restraint does. Taking a person to the station for interrogation without consent requires probable cause (Dunaway v. New York), whether or not anyone said the word 'arrest'. Waking a teenager at night and taking him to the station in handcuffs, with only 'we need to go and talk', was an arrest requiring probable cause (Kaupp v. Texas). A detention that intrudes more than necessary, such as moving a detained traveler to a small room while keeping his ticket and identification, fails Florida v. Royer's rule that a detention use the least intrusive means reasonably available. Handcuffs and drawn weapons do not automatically turn a detention into an arrest; handcuffing an occupant during a high-risk warrant search can be reasonable (Muehler v. Mena). But every escalation must be justified by specific safety facts and must end when those facts end. If you want a suspect to come to the station without probable cause, it must be truly voluntary: tell him he is not under arrest, let him travel on his own if practical, and let him leave. Evidence and statements that follow an unlawful arrest are at risk of suppression (Wong Sun v. United States).
The home gets the strongest protection. Absent exigency or consent, police need an arrest warrant to enter a suspect's own home to arrest him (Payton v. New York). To enter a third party's home to arrest someone, police need a search warrant for that home, absent exigency or consent (Steagald v. United States). The gravity of the offense matters to exigency, and a minor offense rarely justifies a warrantless home entry (Welsh v. Wisconsin). Pursuit of a fleeing misdemeanor suspect does not categorically justify entering a home; exigency is decided case by case on facts such as violence, danger to others or imminent destruction of evidence (Lange v. California). A suspect who is standing in a public doorway when approached on a felony and retreats into the house may be followed in hot pursuit (United States v. Santana). Before you cross a threshold without a warrant, be able to name the exception and the facts that support it, and write them down.
An arrest is the start of the process, not the end. A person arrested without a warrant is entitled to a prompt judicial determination of probable cause (Gerstein v. Pugh). A determination within 48 hours of a warrantless arrest is generally prompt; beyond that, the state must show an emergency (County of Riverside v. McLaughlin). An arrest on a warrant already rests on a judge's finding of probable cause. In San Andreas the arresting officer's probable-cause statement reaches the court through JusticeLink, so it must be filed promptly, completely and truthfully, with the facts, not conclusions, that establish each element. If the probable cause falls apart before charging, for example because the real suspect is identified, the person is released and the change documented. Knowingly holding a person beyond the legally authorized period without charge is §38.80. Write every stop, frisk and arrest as if a judge will test each step, because one will.
Constitution and case law
The federal authorities this module's questions rely on, and the rule the academy takes from each.
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