I was reading the California Vehicle code. It states that bicycles must comply with the same rules as other vehicles. There's nothing that states that cyclists have to put a foot down while stopping. It says that you have to come to a complete stop. You can come to a complete stop using a track stand. If the cop was in front of you or behind you it's going to be hard for him to tell if you stopped. (Bicycles are not required to have brake lights) Maybe you can fight it on that basis. If he was to the right or left of you, you're hosed.

Another interesting tidbit was in the fines section. It states that the maximum fine for a bicycle infraction is $10. You might want to look that up, too.