I know some folks working in secure facilities who actually drill out the camera lens with a drill press and fill the hole with a drying cement. It's effective,

I know some folks working in secure facilities who actually drill out the camera lens with a drill press and fill the hole with a drying cement. It's effective, if a bit... draconian. Though I heard a month or two ago that the regulations for some secure sites have been changed to allow cameras on phones. Several people I know who have not gotten cells are now looking at getting them because they can keep them when at a secure site. This is all experience with military contractors in St. Louis, so your mileage may vary.