California Code, Penal Code - PEN § 3010.2

(a) A continuous electronic monitoring system may have the capacity to immediately notify the department of violations, actual or suspected, of the terms of parole that have been identified by the monitoring system if the requirement is deemed necessary by the parole officer with respect to an individual person.

(b) This information, including geographic location and tampering, may be used as evidence to prove a violation of the terms of parole.