The FCC published an official citation against an individual for advertising an illegal signal jamming device on Craigslist.org in violation of Section 302(b) of the Communications Act and FCC rules.
The FCC states that jamming devices, such as cell phone jammers and GPS blockers, “pose serious risks to critical public safety communications and can prevent individuals from making 9-1-1 and other emergency calls.” Advertise jamming devices for sale to any consumer in the United States through Craigslist or through any other means is also illegal.
http://www.fcc.gov/document/naparty-cited-offering-illegal-jammer-craigslistorg
