You're right!
ALWAYS consent to a search, if you refuse they will take your car apart, if you say "sure you can search my car" they will probably just have a cursory look around.
This is worth watching the entire video, but go to 36.52 if you still think refusing is wise.
Ha, I thought you were being sarcastic at first.
I've seen this guy before! He did a video series called Kopbusters were he set up a fake marijuana grow operation and caught police illegally using infrared scanners. He rented a vacant house, set up some grow lights, put up some cameras, told nobody about it, and waited. Sure enough, the house was raided soon after, supposedly because of a tip from an anonymous informant.
Large spikes in an electric bill can get a grow operation busted.