What is the least level of suspicion required to stop a vehicle?

The least level of suspicion required to stop a vehicle is reasonable suspicion. This legal standard allows law enforcement officers to stop and briefly detain a vehicle when they have a specific and articulable fact that suggests a person may be involved in criminal activity. Reasonable suspicion is a lower threshold than probable cause, which is needed for an arrest or a search warrant. It is based on the totality of the circumstances that an officer observes, such as driving behavior, time of day, or location.

In contrast, no suspicion does not provide a legal basis for stopping a vehicle, as officers cannot randomly stop vehicles without any observed violations or concerns. Probable cause is a higher standard that typically requires more evidence, and high suspicion is not a recognized legal term; therefore, it does not apply in this context. Thus, reasonable suspicion is the proper standard to justify a traffic stop, aligning with the constitutional protections against unreasonable searches and seizures.