Officers conducted a Terry stop of a speeding vehicle registered to an unlicensed driver. The driver lacked a driver’s license but was not the registered owner. Because allowing an unlicensed person to drive a vehicle violates Michigan law, officers sought to discover whether the owner was among the three remaining passengers. The plaintiff refused to identify himself and was taken into custody. Illegal drugs were subsequently found on him. The state court of appeals reversed his drug conviction, and the plaintiff sued claiming he was unlawfully arrested. The federal Court of Appeals observed that an officer may request a detained person to identify himself, so long as the request amounts to one “reasonably related in scope to the circumstances which justified the stop.” Officers were entitled to qualified immunity under both prongs where it was reasonable to believe that the plaintiff’s refusal to identify himself violated Michigan’s obstruction statute and that such an interpretation of state law did not violate the Fourth Amendment.