Can Police Stop Me Without Probable Cause? What Missouri Law Says

Many people believe police officers need probable cause before they can stop someone.

In many situations, that isn’t the case.

Under both federal and Missouri law, officers may briefly detain a person based on the lower legal standard of reasonable suspicion under certain circumstances.

Understanding the difference can help you better understand your constitutional rights during a police encounter.

Do Police Always Need Probable Cause to Stop Someone?

No.

Not every stop requires probable cause.

For example, an officer may briefly detain a person to investigate possible criminal activity when the officer has reasonable suspicion supported by specific, articulable facts.

Reasonable suspicion is a lower legal standard than probable cause, but it must be based on more than a mere hunch.

What Is a Terry Stop?

A brief investigative detention based on reasonable suspicion is commonly referred to as a Terry stop, named after the United States Supreme Court case Terry v. Ohio.

During a lawful Terry stop, an officer may briefly investigate suspected criminal activity. The stop must be reasonably related in scope to the reason for the detention and generally may last no longer than reasonably necessary to address that purpose unless additional legal justification develops.

What Can Create Reasonable Suspicion?

There is no single fact that automatically creates reasonable suspicion.

Instead, courts look at the totality of the circumstances.

Depending on the facts, officers may consider things such as:

• Information from witnesses or victims.
• Personal observations.
• Matching the description of a suspect.
• Behavior observed during the encounter.
• Other facts that reasonably suggest criminal activity.

The reliability and corroboration of information from witnesses, victims, or informants can also matter. Whether reasonable suspicion exists depends on all of the facts known to the officer at the time.

Can Police Stop Me Just Because I Look Suspicious?

Not necessarily.

Reasonable suspicion requires specific, articulable facts supporting the detention. A person’s presence in a particular neighborhood, nervousness, or refusal to answer questions may be relevant depending on the circumstances, but no single fact automatically establishes reasonable suspicion.

Courts evaluate the entire situation rather than relying on any one factor alone.

Does a Traffic Stop Require Probable Cause?

It depends.

A traffic stop may be supported by probable cause that a traffic violation occurred or, in some circumstances, by reasonable suspicion of criminal activity.

Once a lawful stop begins, however, the officer generally may not extend the detention beyond the time reasonably necessary to address the purpose of the stop unless additional legal justification develops.

What If the Stop Was Illegal?

Whether a stop was lawful can become an important issue in a criminal case.

If law enforcement lacked the legal basis to stop or continue detaining someone, a defense attorney may be able to challenge the legality of the detention and, in some cases, seek to suppress evidence obtained as a result of the stop.

Whether suppression is available depends on the facts of the case and the applicable law.

Every Case Is Different

Whether reasonable suspicion existed depends on the unique facts of each encounter. Courts evaluate the totality of the circumstances, and small factual differences can change the legal analysis.

The information in this article is intended as a general overview of Missouri law and should not be considered legal advice for any particular situation. If you have questions about your case, an attorney can evaluate the specific facts and explain how the law applies to your circumstances.

Protect Your Rights

Understanding the difference between reasonable suspicion and probable cause can help you better understand your constitutional rights during a police encounter.

If you believe you were stopped or detained without sufficient legal justification, an experienced Missouri criminal defense attorney can evaluate the facts of your case and determine whether the stop or any evidence obtained may be challenged.

At Landon Miller Law, we represent clients throughout Columbia and Mid-Missouri in criminal cases involving traffic stops, searches, arrests, and constitutional issues. We carefully examine every case to determine whether law enforcement acted within the limits of the Constitution and Missouri law.