> What incentive does the person reviewing the footage have to admit to a false positive

I'd expect it to run like current traffic cameras (at least, the ones in my locality). Fully automatic, you get a ticket in the mail, nobody ever reviews it for accuracy, unless you contest it. Then they usually drop it, though it could end up in traffic court for a judge to look at. Also, our automated ticketing systems generally only use fines as punishment, there's some kind of state law that says you cannot be personally assigned a moving violation unless you were stopped by an actual cop in real time.