I did a post in July about dealing with police. A couple days ago I received the "Busted" DVD from flexyourrights.org. Overall I thought it was good. I recommend it highly, but I would encourage anyone to seem apologetic and/or demonstrate a very mild sense of humor with police, rather than being stiff as depicted in the video.
When you're asked if you've been drinking in a traffic stop, you can just say no. Alternatively, you might say "I'm sorry officer, but my lawyer told me never to answer a question like that."
When they ask to search your vehicle, you say "I'm sorry officer, but my lawyer told me never to let anyone search my car."
Just a thought.