When an arrest or search occurs, it must be supported by legal justification. In Washington State, this legal standard is known as probable cause. Probable cause means that, based on facts and circumstances known to the officer at the time, there is a reasonable basis to believe a crime has been committed.

This standard applies to arrests, searches, vehicle stops, and entry into property. While the legality of police action is not typically debated during the encounter itself, it can later be challenged in court through suppression motions or dismissal arguments.

Arrests

If a warrant has already been issued, the court has determined that probable cause exists. Warrants are often issued for alleged criminal activity or failure to appear in court.

However, arrests frequently occur without a warrant. Under RCW 10.31.100, a police officer may arrest a person without a warrant if there is probable cause to believe that the individual has committed or is committing a felony.

For most misdemeanors and gross misdemeanors, the offense must generally occur in the officer's presence. There are, however, statutory exceptions that allow warrantless arrest when probable cause exists in situations such as:

  • Misdemeanor offenses involving physical harm or threats of harm
  • Unlawful taking of property
  • Certain cannabis or controlled substance violations
  • Underage alcohol offenses
  • Serious traffic-related offenses, including DUI, reckless driving, suspended license violations, or hit-and-run incidents
  • Indecent exposure
  • Interference with health care facility operations within statutory time limits

The legality of a warrantless arrest is often addressed later in court. If probable cause did not exist, your attorney may seek dismissal of charges or suppression of evidence resulting from the arrest.

Searches

In most cases, law enforcement must obtain a search warrant before entering a home or conducting a detailed search of private property. A warrant must be supported by probable cause and approved by a judge.

There are recognized exceptions to the warrant requirement, including consent, exigent circumstances, search incident to arrest, and certain vehicle-related searches. If officers conduct a search without a warrant, the legality of that search can be challenged in court.

If evidence was obtained unlawfully, your attorney may file a motion to suppress under applicable Washington court rules. Suppressed evidence cannot be used at trial.

During street encounters, officers may conduct limited pat-down searches (often referred to as “Terry stops”) if they reasonably believe a person may be armed. More invasive searches, such as strip searches or body cavity searches, generally require additional legal justification under RCW 10.79.140.

While individuals retain constitutional rights, resisting or obstructing an officer during an arrest or search may result in additional charges. Legal challenges to probable cause are most effectively addressed in court through formal motions and hearings.

Challenging Probable Cause

Probable cause is not unlimited. If law enforcement acted without sufficient legal justification, an experienced defense attorney can examine the facts, challenge unlawful searches or arrests, and seek suppression of evidence where appropriate.

If you or a loved one is facing criminal charges in Washington, early legal intervention can make a significant difference. Contact the Law Offices of Steve Karimi for a confidential consultation and strategic evaluation of your case.