Maximum illumination with no flashing lights facing forward [contingent upon location of the stop], an attention diversion, and a high power flashlight into the eyes of the driver. Passenger side flank approach was employed often, since I worked a rural area the final half of my time.
When recontacting the driver, I always changed my approach to prevent prediction of tactics.
Dear God, this is one of the dumbest ideas I've ever heard. It's got to rank right up there with CALEA. -Pepper45
Bastard! - TBO