California Code, Penal Code - PEN § 3010.4

(a) The department, operating a system of continuous electronic monitoring pursuant to this section, shall establish prohibitions against unauthorized access to, and use of, information by private or public entities as may be deemed appropriate. Unauthorized access to, and use of, electronic signals includes signals transmitted in any fashion by equipment utilized for continuous electronic monitoring.

(b) Devices used pursuant to this article shall not be used to eavesdrop or record any conversation, except a conversation between the participant and the person supervising the participant that is to be used solely for the purposes of voice identification.