I got nailed in the Presidio late last year. The Presidio Park Police (Federal), or whatever they are, nailed me and another cyclist at the same time for blowing through a stop sign. It's a great little S turn leading into the back parking lot of the GGB. It was a $100. He had been slowly tailing us and probably knew we wouldn't stop. I'd say about 70% of the cyclists don't stop.
No doubt our ticket revenue went to Bank of America...