This is probably an area where SDR's with send capability could in theory be prosecuted as a jamming device. Whether it's been interpreted that way or enforced ever is unknown to me. A purpose built device advertised as a jammer would absolutely be a problem.
Oh also, the 1934 communications act is supposed to prohibit US/state governments from using such devices as well, but they've ignored the law. Some companies in the 2000's challenged it for use in their buildings and afaik lost the cases. My experience dates from that same time range when they were sort of accepted as de jure illegal but there wasn't de facto enforcement.... also networks use more bands now so a jammer covering more frequency ranges would be needed. back then they could do 3 ranges (850mhz-ish, 1900mhz-ish, 2100mhz-ish), now there would be way more like 3.7ghz down to 600mhz. Ignoring mmwave, that's not going to be in your bathroom.
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Actually, just being in possession of such a device in the US isn't legal. Whole FCC page on it with citations: https://www.fcc.gov/general/jammer-enforcement
This is probably an area where SDR's with send capability could in theory be prosecuted as a jamming device. Whether it's been interpreted that way or enforced ever is unknown to me. A purpose built device advertised as a jammer would absolutely be a problem.
Oh also, the 1934 communications act is supposed to prohibit US/state governments from using such devices as well, but they've ignored the law. Some companies in the 2000's challenged it for use in their buildings and afaik lost the cases. My experience dates from that same time range when they were sort of accepted as de jure illegal but there wasn't de facto enforcement.... also networks use more bands now so a jammer covering more frequency ranges would be needed. back then they could do 3 ranges (850mhz-ish, 1900mhz-ish, 2100mhz-ish), now there would be way more like 3.7ghz down to 600mhz. Ignoring mmwave, that's not going to be in your bathroom.