Understanding the difference between probable cause and reasonable suspicion is imperative to ensure that your rights are not violated by law enforcement. Continue reading for more information and contact a knowledgeable Mercer County criminal defense lawyer with any questions or concerns.

What is Probable Cause?

In New Jersey, probable cause is the legal standard required for police to make an arrest or conduct a search (with or without a warrant). It is defined as a well-grounded suspicion that a crime has been or is being committed, and that the person to be arrested committed it, or that evidence of the crime will be found in the place to be searched.

This standard requires more than just a gut feeling. Officers need a fair probability, based on the totality of the circumstances and facts available at that time, that the action is justified. The facts must be sufficient to lead a reasonably cautious person to believe a crime has occurred or is occurring. If an officer has probable cause, they can make a lawful arrest, convince a judge to issue a warrant, or conduct a search of a vehicle or person.

What is Reasonable Suspicion?

Reasonable suspicion is a lower legal standard than probable cause, but it is necessary for law enforcement to legally stop and temporarily detain a person for questioning. This standard requires specific and articulable facts, which, when combined with rational inferences, reasonably warrant the intrusion.

Similar to probable cause, an officer cannot rely on a suspicion or a hunch. The facts must point to the possibility that criminal activity is occurring or may occur. If an officer possesses reasonable suspicion, they are generally permitted to conduct a brief investigative stop, known as a Terry stop, and perform a frisk if they reasonably believe the person is armed and dangerous. The focus is on a quick investigation to confirm or dispel the officer’s suspicion.

What’s the Difference Between Probable Cause and Reasonable Suspicion?

While probable cause and reasonable suspicion both serve an important purpose in the criminal justice system, there are a few important differences you should be aware of. Understanding these distinctions is essential for determining the legality of police conduct in New Jersey.

The most important differences between the two legal standards are:

  • Threshold of proof: Probable cause is a substantially higher burden, demanding a well-grounded suspicion and a fair probability of criminal activity. Reasonable suspicion, however, only requires specific facts suggesting possible wrongdoing, making it a much lower standard.
  • Permitted action: Reasonable suspicion only authorizes a brief, temporary investigative stop and a protective frisk if the officer believes the person is armed. Probable cause is the necessary legal threshold for a full custodial arrest, an in-depth search, or the issuing of a warrant.
  • Scope of intrusion: The scope of a stop based on reasonable suspicion is strictly limited to confirming or dispelling the officer’s initial suspicion. Actions taken under probable cause, however, allow a much greater infringement on an individual’s liberty and privacy.
  • Legal context: Reasonable suspicion applies to stopping a person to investigate, while probable cause is needed to formally detain them.

Knowing these differences allows you to understand the limits of the police and protect your constitutional rights in New Jersey.