Police lie and call it "bluffing".   The courts uphold it.  They are not your friend.

legal expert
http://www.youtube.com/watch?v=QuGcaxzY1vs

lying cop
http://www.youtube.com/watch?v=6wXkI4t7nuc

Cop caught not wearing seatbelt gets his revenge.
http://www.youtube.com/watch?v=QuGcaxzY1vs