Yep it's a policy not a law. if discovered they can only ask you to leave.
Discretion is required as wouldn't want any socialite snob offended.
Went to the Fox to Jethro Tull carried. Went to the Fox to see "A Christmas Story" (you will shoot your eye out) and metal walk through detectors and wands used and had to leave my weapon in the truck to make the leftist "feel safe".
So the fox is random - good to know