It was kinda funny the "third-degree" that I got coming back to the states from amsterdam, The line "Are you Absolutely sure there's nothing to declare, or that No-One has tampered with your luggage?"...repeated at least 3 times.
...I was beginning to wonder, was I being set-up for something...
Back to the question of whats appropriate, the officer could request/order (And this could be done by loudtalker/loudspeaker, while the officer is still in his squad.) the driver to immediately exit the vehicle alone and hands visible and stand at the rear of the car...noncomplience at this request is cause for the shotgun to appear.