Is it permissible to use jammers in U.S. prisons?

Hello Austin! Each country has a different definition of whether it is legal to use signal jammer. In the U.K. and Japan, for example, anyone can own a jammer -- as long as they don't use it. Dozens of countries, including Canada, Mexico, New Zealand, Norway, Turkey and others, allow the police or prison officials to use jammers. Chinese and Indian schools use jammers to stop cheaters. Mexico allows jammers in churches and hospitals. And Pakistan allows jamming in banks and libraries. At present the United States government and prisons are using jammer, police are also applying to use jammer device. I believe the future will be open for use of jammers in more and more field. I hope my answers to help you.