Keep in mind that many secure no-cell-phone zones, even those that host classified data are still relatively physically open. The personnel allowed inside them are strictly vetted and trained to be self-policing, but it's only the threat of discovery and harsh punishment stopping someone with the right badge/code from physically bringing in a phone. There generally aren't TSA-style checkpoints or patdowns. Happens accidentally all the time, especially in the winter with jackets.

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AnthonyMouse 3 hours ago | parent | next [-]

This is misunderstanding the purpose of the restriction.

The main reason not to bring a phone into the room is that the phone could be compromised. If the person is compromised then a device isn't your problem, because they could view the documents and copy them on paper or just remember the contents to write down later.

	▲	kube-system 3 hours ago \| parent [-]
		In a corporate environment no-camera/no-phone policies are sometimes also used for DLP reasons, out of expediency. Oftentimes it is more profitable to hire less trustworthy people (read: cheap labor) and simply make it inconvenient to steal data. This usually works good enough when you're trying to protect widget designs and not human lives.

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pphysch 3 hours ago | parent | prev [-]

Can't you have one or more x-ray tunnels or other scanners? They don't even need to be actively monitored, just treated like CCTV.

	▲	wildzzz 12 minutes ago \| parent [-]
		Receving a full body x-ray every day just for a week would exceed the yearly federal occupational dose for radiation workers. You would add an additional 26% lifetime chance of getting cancer doing this for a year. The yearly limit for rad workers is 5000 mrem with most receiving none. Receiving any dose is usually a cause for concern at most facilities that handle radioactive materials. A full body x-ray would dose you with about 1000 mrem. For about every 10000 mrem you receive, you gain an additional 1% chance of lifetime cancer risk. There's a reason why you wear a lead apron when getting X-rays at the doctor's office and why the technician leaves the room. Metal detectors would be a much more reasonable method. People that work at airports, courts, jails, some schools, and even some manufacturing facilities walk through metal detectors daily.