sure, but how often does a traffic stop lead to the discovery of evidence that justifies a charge for a white collar crime? the person would have to be driving around with incriminating (likely very technical) documents and do something that gives the officer probably cause to search the vehicle. the papers won't even look bad unless the officer already knows what to look for.

on the other hand, traffic stop -> suspected intoxication -> field sobriety test / drug dogs seems like a very common routine.