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Many layers of physical controls and regular audits mostly.

What does a physical control mean in this context? Like, disabling that part of the phone's touchscreen?

Think personal devices not being permitted beyond the entrance of the building, stored in a Faraday box.

So in other words... nothing stopped anyone from doing this either. Except the fear of potential punishment.

I'm not sure how you ignored the "many layers of physical controls" part of the comment.