if you;re 18, you're not a minor anymore. so if you were charged, it would be on your perm record. if they let you go, you are fine. JUST MAKE SURE YOUR DONT HAVE ANYTHING AT HOME, i mean anything at all. if they do decide to pay you a visit, and they can, since they have probable cause that you may have more shit at home. get rid of everything. including empty vials. BTW, you should get rid of empties and used needles right after use. what were you thinking? were you going to make a necklace from the used amps? 
