Best trick is: "we need to make a copy of your license."

They don't need to.
If they press too hard, walk quickly to the nearest exit. They always ask me and always say no. I also give them a phony name and a gmail address that matches the phony name. I also use my Magic Jack phone number so when they call they get the computer...I never answer it, just make calls.

I've not been turned down for a test ride. But, I could be and in that case I'm leaving. They will run a credit check at worst and inundate you with phone calls and email at best. If I like the car, we'll negotiate the price. If I like the price we'll sign papers. I also don't use dealer financing as they use too many loopholes (i.e. interest up front is one). I go to a credit union and get a check and bring it back.

Just remember, it's your personal information. When you give it out, it becomes everybody's personal information.