What level of suspicion is required to detain someone?

• A. Probable cause
• B. Reasonable suspicion
• C. Beyond a reasonable doubt
• D. No standard required

Answer: (B)

Reasonable suspicion is the level of justification that permits an officer to briefly detain someone for a stop. It’s more than a guess but less than probable cause. The law requires specific, articulable facts—considered in light of the total circumstances—that would lead a reasonable officer to believe criminal activity may be afoot. This standard is used for temporary detentions and field investigations, like a stop-and-frisk, where the officer aims to confirm or dispel the suspicion without turning it into an arrest.

Because the requirement hinges on concrete observations, a suspect’s behavior, location, timing, and any corroborating information all matter. The detention should be limited in scope and duration to what is needed to verify the suspicion; if facts later establish probable cause, the officer can proceed with further action. If not, the person must be released and the stop ends. In contrast, probable cause is required for an arrest or a search warrant, and a conviction relies on proof beyond a reasonable doubt.