Originally Posted by
dgolding
I was under the impression that use of such jammers is illegal and that the prohibition applied to the government as well.
That is correct in the USA, per FCC regulation (47 U.S.C. § 333). However, that only covers devices that are actively radiating energy in the Radio Frequency spectrums. It does not prohibit the use of passive Faraday Cages to block RF emissions.