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What's the Difference Between Detention and Arrest?

Posted by Dmitry Gorin | Apr 28, 2025

Understanding the crucial difference between being arrested and being detained under California law is a powerful tool for protecting your rights. These two legal concepts, while seemingly similar, represent distinct stages of law enforcement authority. Knowing your rights in these situations is not just crucial, it's empowering. It can help you respond appropriately and protect yourself legally, making you feel more informed and prepared.

In California, a detention is a temporary stop by police to investigate a suspicion of criminal activity. At the same time, an arrest is a more formal action where someone is taken into custody due to probable cause, believing they have committed a crime.

Difference Between Detention and Arrest

Detentions are based on reasonable suspicion, while arrests require probable cause. The purpose is to briefly stop and question an individual based on a reasonable suspicion of criminal activity, such as a traffic stop or questioning someone exhibiting suspicious behavior.

Reasonable suspicion means that the person may be involved in criminal activity, but the detention may not last longer than necessary to address the suspicion.

Detention might involve being stopped and questioned, but doesn't necessarily involve physical restraint like handcuffs. Anyone detained has the right to remain silent and to be informed of the reason for their detention.

The purpose of an arrest is to take someone into custody and formally charge them with a crime, but there must be probable cause to believe that the person has committed a crime. An arrest typically involves being taken into custody and potentially booked into jail and includes physical restraint, often with the use of handcuffs. Again, the suspect has the right to remain silent, the right to an attorney, and the right to be informed of their Miranda rights.

Detention is a less intrusive action than arrest, as it doesn't necessarily involve taking someone into custody. An arrest triggers formal legal proceedings and potential criminal charges, while detention may lead to further investigation but not necessarily charges.

Detention: Based on Reasonable Suspicion

Detention occurs when law enforcement stops and temporarily holds an individual for questioning to investigate potential criminal activity. While this restricts your movement to some degree, it does not carry the same weight as an arrest.

Police are permitted to detain someone if they have "reasonable suspicion" that the person is involved in criminal activity. Reasonable suspicion is based on specific, articulable facts rather than mere hunches. Common scenarios of detention include:

  • Being stopped for questioning while walking through a neighborhood after someone reports suspicious activity in the area.
  • Being pulled over for a traffic infraction, such as speeding or a broken taillight.
  • Encountering officers in a location where a crime has just occurred and matching the general description of a suspect.

Although detention limits your ability to leave or to move freely during the interaction, you should not be handcuffed.

Police Detention

Detention is typically brief and focused on clarifying whether further steps are necessary. For instance, if officers stop you for questioning and determine you were uninvolved in the suspected crime, they are generally obligated to allow you to leave.

Even if police have reasonable suspicion to stop someone briefly, the officer can't frisk a detained suspect unless reasonable suspicion exists to believe that the person is armed and dangerous. But for that reason, an officer can pat down the suspect's outer clothing in a search for weapons.

If the officer encounters contraband (like a bag of methamphetamine) during a limited pat-down for weapons, that seizure will usually be found valid. In this scenario, the officer would likely transform the detention into an arrest by further restricting the suspect's freedom, such as using handcuffs and placing the suspect in a patrol vehicle. 

Your Rights During a Detention

During detention, you are not required to answer incriminating questions. You have the right to remain silent and may ask whether you are free to go. If the officer says yes, then you can leave. This knowledge gives you a sense of control over the situation, making you feel more secure and confident.

Law enforcement cannot detain someone indefinitely. Detention must be proportional to the suspicion at hand, meaning it should not last longer than reasonably necessary for the officer to either confirm or dispel their suspicions.

Sometimes, law enforcement may detain someone longer than necessary, perhaps for purposes of manipulation or intimidation to try and "get a confession" out of them. This often qualifies as unlawful detention and is a violation of your Fourth Amendment rights. If this happens to you, speak with an attorney as soon as possible.

Arrests: Based on Probable Cause

An arrest represents a significant escalation of law enforcement authority. Unlike detention, which is based on reasonable suspicion, an arrest requires probable cause. Reasonable suspicion means that the police have a reasonable belief, based on specific facts, that you may be involved in criminal activity.

Probable cause, on the other hand, means that there is enough evidence or information for a reasonable person to believe that you have committed a crime. When you are arrested, officers may take several steps:

  • Informing you that you are under arrest.
  • Taking you into custody, often by physically restraining or handcuffing you.
  • Transporting you to a police station or jail for processing, including booking and fingerprinting.

The police must clearly articulate the cause for your arrest. For instance, if officers have video evidence of you allegedly shoplifting, they may arrest you based on that evidence. Once you're arrested, your freedom is significantly restricted until you're released on bail, appear before a judge, or charges are dropped.

Arrests

An arrest carries serious legal and personal consequences, often leading to official charges and an arrest record. If you're ultimately convicted, your criminal record can affect your employment, housing, and other aspects of your life. 

It's important to understand that an arrest is a serious matter and can have long-lasting effects on your life. It could potentially affect your ability to secure certain jobs, obtain loans, or even travel to certain countries.

Simply put,  an arrest is the use of legal authority to deprive a person of their freedom of movement. An arrest is generally made with an arrest warrant, but may be made without a warrant if probable cause and exigent circumstances are presented at the time of the arrest.

Detention vs. Arrest in California Law

The distinction between detention and arrest often comes down to the level of evidence law enforcement has and the level of control imposed on the individual. Remember the following key elements:

  • Detention is a temporary stop based on suspicions.
  • Arrest is a formal deprivation of liberty based on probable cause.

California law plays a crucial role in tightly regulating both detention and arrest, serving as a safeguard against potential abuse of police authority. This should reassure you that there are legal protections in place to ensure fair treatment, providing a sense of security and reassurance.

Arrested and Later Released

Whether you have been detained or arrested, law enforcement cannot hold you for more than 48 hours (Sundays and holidays excluded) without charging you for a crime. Additionally, under California Penal Code 849.5 PC, if you are arrested but the investigation does not result in criminal charges, the arrest record must reflect a release. 

The release effectively reclassifies the incident as a detention instead of an arrest. This distinction is crucial because an arrest record can have long-lasting consequences on employment, housing, and other aspects of life. For example:

  • If you were mistakenly arrested for a crime and released without charges, the release notation prevents the arrest from appearing as part of a criminal record. Instead, it is treated as a non-arrest detention.
  • You also have the right to request correction of your record if this process was not properly followed.

Fourth Amendment Rights 

A police officer's level of suspicion of criminal activity affects whether the officer's subsequent actions are reasonable under the Fourth Amendment. Courts will evaluate all the circumstances surrounding the interaction.

If an officer has only reasonable suspicion of criminal activity but conducts a full-blown arrest and search without probable cause, the search and seizure would be unconstitutional. And any evidence found during the unlawful search likely wouldn't be admissible in court, although exceptions may exist.

Notably, not every interaction with an officer requires the officer to give a Miranda warning. If an officer stops someone on the street to ask a question and the person voluntarily confesses, it will be admissible in court. It's typically best not to offer up anything other than your name and identification without first consulting with a lawyer.

For more information, contact Eisner Gorin LLP, our California criminal defense lawyers, located in Los Angeles, CA.

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About the Author

Dmitry Gorin

Dmitry Gorin is a State-Bar Certified Criminal Law Specialist, who has been involved in criminal trial work and pretrial litigation since 1994. Before becoming partner in Eisner Gorin LLP, Mr. Gorin was a Senior Deputy District Attorney in Los Angeles Courts for more than ten years. As a criminal tri...

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