Bangers has it right...if you're being followed, do the right thing and duck out somewhere. Or if you're close enough, keep riding and have them follow you to a police station or fire station. That will get them off your back quick.
Honestly, the law applies just as much to moped riders as it does to drivers in a vehicle. It would be tougher to argue down why you're carrying a concealed weapon (which in some places can be interpreted as almost anything) on your person, rather than reporting an incident to the cops. At least that's my opinion...