Interesting factor in this, is that if States move to mandate "smart guns", the RF signal (even passive ones) could theoretically be jammed in a time of civil unrest.... Cat 5 hurricane hits and your urban center falls to chaos, just turn off all the guns (completely eliminating the ability for self defense). It's once of those nasty-little second order effects that could be seen, similar to the proposed "kill switch" on cell phones. Sure, your phone gets stolen, and it becomes a paper weight.... but it could also be, that someone in authority doesn't like what you or the masses are communicating... whoops... just turned them off... too bad.