Reasonable Suspicion Arising After An Officer's Order to Stop

Normally, a law enforcement officer will attempt to develop reasonable suspicion before instructing a person to stop. But what if the officer does not have reasonable suspicion at that point, yet develops reasonable suspicion prior to the suspect's compliance with the officer’s instruction? For example, suppose that an officer sees a vehicle weaving within its lane of travel. Standing alone, this does not provide reasonable suspicion that the driver is impaired, and it will not support a stop. State v. Fields, 195 N.C. App. 740 (2009). Assume that the officer, not having read Fields, nonetheless activates his blue lights. The driver then changes lanes without signaling before pulling over. It turns out that the driver is impaired, and prior to his DWI trial, he moves to suppress, arguing that the stop was not supported by reasonable suspicion and citing Fields. Can the stop be justified based on the driver's failure to signal while changing lanes in violation of G.S. 20-154(a), even though the violation took place after the officer attempted to initiate the stop? Probably so. In California v. Hodari D., 499 U.S. 621 (1991), the United States Supreme Court held that an officer's show of authority is not a seizure until the subject complies. Because the propriety of a seizure depends on the facts known at the time of the seizure, it appears that events after an officer’s show of authority, but before a suspect’s submission to it, may be used to justify the seizure. At least that's the conclusion [...]