Oddly enough, the sagging style is derived from admiration for guys who are in jail (belt and shoelaces are removed from prisoners in case the decide to harm themselves or others with them). So it may possibly be bizarrely appropriate to put the saggers in jail.
However, it is a waste of taxpayer resources in my view to arrest and jail folks for clothing infractions. After all, no one arrested Janet Jackson, did they?
I think we ought to have a law that allows us to depants any saggers that we see.