thats EXACTLY what EVERYONE needs to be doin. it aint illegal to record it. and right there it just shows that his "real" reason he pulled you over was cuz of the Mayhem sticker. i GUARANTEE it!!!
its just better to record it without them knowin so you can catch them slippin like you just did. good job buddy.
oh and by the way, it is NOT illegal to have your front windows tinted. its ONLY illegal if the windows are UP while DRIVING. so if your windows were down at the time, tell him to FUCK OFF!!!