Can signal jammer be legally used in US prisons

Christiana March 2020

I heard that some prisons have started to use this equipment to supervise prisoners. Is this true? If so, where can I buy it?

Jammer-Mart March 2020

A prison in North Carolina is now being tested. The warden bought a batch of signal jammer at the famous dealer jammer-mart.com.

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Use signal jammers to protect yourself from uavs