They would put out the word that you turn them in by x or face 20 years in federal "pound you in the arse" prison. Most would turn them in.
The ones that didn't would either hide them to where they were essentially useless or would get caught sooner or later.
However, I doubt they would try confiscation. Making then non-transferable would do the trick, but would take longer.
Last edited by CarryTexas; 11-10-2012 at 20:33..