From United States v. Robinson, an unpublished 11th Circuit decision last week on whether the police had reasonable suspicion to prolong a traffic stop for a few minutes given their suspicion that the driver was a drug courier:

  After Robinson pulled the car over, he got out and went to the rear of the vehicle. Deputy Crowe asked Robinson for his driver's license, which Robinson provided. Crowe then enquired who owned the car and where Robinson was going. Robinson told Crowe that a friend of his, a stripper named "Fluff," had lent him the car to drive "Mouse" (Mills) to Delaware. When Crowe asked for the car's insurance and registration papers, Robinson told him that Mouse had them.
  Crowe went to the car, asked for Mills' real name, and requested the insurance and registration papers. When Mills complied, Crowe saw that the insurance on the car was valid but made out to "John Greggo."

It seems to me that if you're a drug courier driving a car registered to Mr. John Greggo, you should have a story ready to tell the police better than that a stripper named "Fluff" lent you her car to drive "Mouse" to Delaware.