Illegal to ride a dirt bike here?

I live in arizona and there is a flat area of dirt about 2 blocks big that has been there forever. I live across the street from it but i also live a block away from a police station and they use a road that runs by this "flat area" im asking about. Anyways i was wondering if it is illegal to ride my kdx 220 dirt bike there. (I have a spark arrester on the bike) what would they do if i got caught?