The headline isn't quite accurate. What they're really saying is that they'll confiscate the weapons if they see them, which is the deal they reached with the Hezzies a few weeks ago.
I'm reminded of the old routine, familiar from my youth, where a cop wishing to give you a break says, "you better get rid of that before some peace officer sees it".
I had the in parens comment modified to reflect that.
Thanks!