Couple of times:
1. Late 1990's in Davis, CA., got pulled over by a bike cop on campus. He blew a whistle, then came after me hammering.
2. 7-8 years ago in Marina Del Rey for running through a red light. Sheriff in squad car pulled us over, let us go w/a warning. Never ran those lights again!
Funny because the next time I saw the bike cop I was speeding through doing like 30mph and I just didn't even give him a 2nd look
haha