anything from trespassing ticket, to a misdemeanor criminal damage to property, depending on location and the cop.
Its always just a good idea to be courteous and polite to any citizen that complains and any cop that shows up. Respect gets respect just like anything.....
Also, your chances are way less of getting hassled if you keep your crew to just a couple people, music low, and dont generally act like idiots. Most people wont complain because your are hitting a rail, they will complain if you are loud or drinking etc.
my .02
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