I hope they've done their testing well. Casinos don't get a lot of slack from the public. One single mom with a pacemaker and this could end badly.

If someone really wants to shoot someone else in said casino it's probably because they want to shoot their former boss or whoever got them fired. Being a former employee puts them in a great position to know via the grapevine what the edge cases for the system are. This system is mostly to reassure the overly-worried.