For the VIP "tour" visitors are stripped naked and given a pair of booties to wear. All personal items are left with their clothes in a small bag that is locked in a vault until the tour is over. Before going through the facility, everyone also has a body opening search, a magnetometer scan and and X-ray scan. If any dental gold is present, your mouth is wired shut for the tour duration. Even the Queen had to endure this -- and she wanted to bring in her pet legless dog-worm things, too.
All this is quite similar to the new voting laws proposed in Alabama -- except the Queen can't vote there.