Palm Beach County Sheriff's and Broward County Sheriff's, local police departments(Boca, Delray, West Palm Beach, Deerfield, Boynton Beach, Coconut Creek, Parkland, Etc), Florida Highway Patrol... Don't seem to care much.
They've all passed me going full throttle knowing I know I'm traveling faster than 33mph... Sometimes I'm pedaling and I know I'm doing close to 40mph..... you know I keep on waiting for them to harass me about something but they never do. The ones I have talked to here are more curious about the cost of operating one, not whether or not I'm driving it legally.
The fine line is anything under 50cc and doesn't travel faster than 35mph. Anything over that requires registration, insurance and a driver's license.
And let's all be honest here I don't live in a small City. Big city cops don't care or areas with large populations, they have real crime to worry about.
I don't wear a helmet, I haven't found one I like. I know I know my girlfriend's on my ass about it all the time LOL. And yes I have had Vehicles run me off the road but that happens more on 2-lane roads than it does on 4-lane roads and that's what we mostly have down here are 4 & 6 Lane roads with of course a bike lane and I havent even been harassed when ive been on the sidewalk.