Wrong. Yes, a car is not a home and almost all states allow warrantless searches of cars. But in all cases they need to have Probable Cause. Pulling someone over for "any reason" is not grounds for searching their car. This is well-settled law that goes back to the Carroll case in the 1920s. Minor traffic violations which do not lead to arrest are not a basis for a car search. They can shine their flashlights in the windows all they want to see if anything incriminating is in plain view, but they can't search a car without probable cause or without the consent of the driver/owner.

http://caselaw.lp.findlaw.com/cgi-bin/getcase.pl?court=us&vol=267&invol=132

http://caselaw.lp.findlaw.com/cgi-bin/getcase.pl?navby=case&court=us&vol=456&page=823

Trampy