When I used to work at a grocery store, a fun activity on a slow day was shoplifter hunting. Now that I work nights in a hotel, there is a similar game. So far, every room that I have reported to the boss as being "one ot watch" has ended up with drug items in it. It's nothing that I see them do that would be a legal reason to have the police search the room, but it's just a set of behaviors that it seems only dirt-bags have.

Fazor's comments above play into my last one. Act like a crook, you get treated like one. There is a big difference between
A. I don't have anything like that in the car, but I also need to get to where I was going. You won't find anything if you search, and I would prefer not to waste either of our time while it's done.
And
B. Why? I don't got nuthin. You don't have a warrant even. You can't do this. This is harassment.

Acting nervous will trip the alarm for most cops. Most expect a little anger, but a lot of it, or being nervous at all and they know you're hiding something.

Like I said, I've been pulled over a lot, mostly for expired plates, but twice for speeding and I've never even been asked to step out of the car. If it's night turn on the dome light as soon as you get stopped so they can see into the car. Don't go for you wallet or registration until they ask and can watch you do it. Don't be nervous. Don't lie. If you were doing 85 in a 65 and they ask if you know why you got pulled over, tell them "speeding". It amazing how well that works. My 85 in a 55 (construction zone with double fine) turned into 75 in a 65 not a construction zone, and saved me $120. I'm sure it was because I pulled over as soon as I knew he was on me, and I told him flat out how fast I was going and why.

I've also seen many of the shoplifters at the store lie and try to play lawyer and have it not work out so well for them. One guy was told that if he didn't shut up he would be riding to jail in the back of the truck. With the dog. I had to duck around the corner to laugh.

__________________
I'm not evil.
An evil person would do the things I think up.