One time me and some friends got pulled over and we were all 15-16 and we had a bunch of pot and a few half-empty liquor bottles in the car. The reason we got pulled over was because my friend had just bought his car and had the temporary plate from the car lot still on.

So when he asked to search the car my friend politely said no. The cop proceeded to question us about where we were going and what we were doing and none of us lost our tempers or anything.

I don't know if the cop got a more important call he had to respond to, or if he decided he didn't want to be late for supper waiting for the drug dog, but he came running back to the car, gave my friend our licenses and the car's registration back, and took off with his blue lights on.

If you are guilty, and you know you're gonna get busted, it may play to your advantage to stall/waste their time as much as you can.