already dealt with:
TERRY v. OHIO, 392 U.S. 1 (1968)
http://caselaw.lp.findlaw.com/cgi-bin/getcase.pl?court=us&vol=392&invol=1
Cops know it well.
I just came back from South Texas and on the way I had to go through a checkpoint. I think they flagged me and had me pull over to the side because I told the man running the checkpoint that the car wasn’t under my name. They proceeded to pat me down and tear my car apart. They even opened my hood and interrogated me about when and where my headlamp had been changed.
Do you think this ruling can be applied to the Constitutionality of that search?