I once had a Manassas Park cop follow me (late at night). I was right near my house, so I stopped at the stop sign right outside my house, hit the garage door opener (while the cop was probably wondering why I'm stopped at the stop sign for an extra few seconds--he couldn't see my garage door opening from where he is).

I started moving again, pull RIGHT into my garage, and hit the button to close it.

As the door was about 1 foot from closing, I saw the cop car go by. It's not the fastest garage door around, so I know the cop stopped and watched me pull into my garage.

I'm pretty sure he was following me since there are at least 2-3 places where he could have turned off between where he started following me and my house.

I have no idea why he was following me, I only know that he was.