Everyone needs to know the laws and availability of cell phone jammers. BUT when law enforcement wants to prevent signals from deleting a phone booked as evidence, they use a $25 bag; when parents want a quiet room, they built a "shield" into the wall, when anyone want a quiet space (cell phoneless) in a car or office, there are ways. Actually, they aren't jamming as much as blocking. The book of advice and availability of solutions costs $20.


Problems such as privacy invasion, academi...
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