North Carolina trooper issues warning citation but extends the traffic stop because motorist (1) appears nervous; (2) has clothes, food, and an energy drink on hand; (3) doesn’t remember an address he recently visited with aid of a GPS device; and (4) remarked that he buys cheap cars online. A drug doggie sniff turns up drugs. Fourth Circuit: Conviction vacated. None of those things is suspicious enough to justify extending the stop.