Two stories in the news recently about "fake cops" harassing motorists. Just an FYI because if you're "pulled over" on a bike by someone with bad intentions you have less of a physical barrier.
If a cop, or someone you think may be a cop indicates that you should pull over, remember to do so in a well lit public place if possible, and remember that you have a right to see a badge, and can call 911 to verify that it's a real cop if they're plainclothes. Unfortunately there have been stories of people with a power complex that use flashing lights and sirens to intimidate and harass (and possibly harm) people, and on a bike you're a little more visible and vulnerable. So be careful out there!