The operation of transmitters designed to jam or block wireless communications is a violation of the Communications Act of 1934, as amended ("Act"). See 47 U.S.C. Sections 301, 302a, 333.
Also LEO data terminals use commercial LTE these days.
"They" in this case was the BART Directors, not the police, and this was not the first time the Directors chose to disable cell service at various stations in the system.
Also LEO data terminals use commercial LTE these days.