depends how much, its its alot, youll be going to jail, if its not alot, its still a POST OFFICE BOX, fedral POST OFFICE, its a fedral offense... just be careful... never send over night, USPS are allowed to search overnight mail(domestic), the good thing with like a UPS BOX is its not a fedral organization running it, so you might jsut get a letter telling you exactly how agry they are, haha, but UPS can search all there pacages no matter what, so.. take your pick