On a stormy evening, you have been assigned as the "ticketing officer" of the night, which involves parking out on the major route that runs through your town with speed radar gun in hand. Without fail, in ten minutes you clock a car at 80 MPH in the 50 MPH zone. Once you catch up to the car and pull the speeder over, you walk up to the driver's side door and bend down to peer in. As the words "license and registration please" come out of your mouth, you notice a bag containing a suspicious-looking substance sitting on the passenger seat. The concept of reasonableness is linked to _____________. probable cause "good faith" exigent circumstances electronic surveillance