The problem with jammers is that if you don't shield the building where you're using them, you're going to interfere with the outside which is a potential public safety risk (it's illegal for a reason).
Of course, if you bother shielding the building, you don't even need jammers, because there's no signal going through anyway.
In college I was taking a course on MATLAB. Traditionally the tests had been taken on paper, but my professor wanted us to be able to use the documentation for part of the exam. His solution? Unplug the fiber cable connecting the switch for the lab to the rest of the network.
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[ 5.4 ms ] story [ 19.5 ms ] threadThe US will probably start mandating cell phone jammers to be purchased by every school district for "national security reasons".
Of course, if you bother shielding the building, you don't even need jammers, because there's no signal going through anyway.