"...I get nervous when I have a cop behind me, regardless of how well I generally drive and the fact that I've never been pulled over for doing anything wrong or harrassed by a cop in any way..."
Being jittery is absolutely normal behavior. When one considers the financial penalties (we're talking THOUSANDS of dollars, folks...) that can be imposed upon drivers by insurance companies via premium surcharges for a "mover" violation...that is cause for nervousness. As an aside, it doesn't matter if one has been driving thirty years without any mistakes. A single speeding ticket will ultimately cost you BIG bucks.
Toss a sniffing police dog (who is rewarded for certain behavior) into the mix and see how some sweat forms on a driver's forehead.
~ Blue Jays ~