OK, then you should have a duty to be reviewed for a driver's license, that is a deadly weapon... How about a government review to get married or have babies? Having babies could be a drain on the government and other peoples standard of living... Why not require a background check for anyone buying a knife, those are certainly a deadly weapon. Do we need a mental health review to buy a steak knife? More people have probably been killed by a steak knife than by a gun in this country (and that is a hyperbole as I have no stats).