Ok, the dream would probably freak me out a little too. Cops used to scare me, especially right after I started driving, but remember, they are just people. Most of them are really nice people. Be nice to them, they'll be nice to you, just like anyone else. And don't forget to come to a complete stop.
There actually was a Sheriff about 20 miles from where I live that shot a kid for speeding. The kid pulled over and was reaching across the seat to get his insurance card out of the glove box, the Sherrif drew and shot without warning, killed the kid. The Sherrif was forced to retire after that. I think that's all that happened to him though. It's been about 12 or 15 years ago.