Cal. Penal Code § 11474

An order authorizing an interruption of a communication service shall include all of the following: (a) A statement of the court’s findings required by Section 11473. (b) A clear description of the communication service to be interrupted, with specific detail as to the affected service, service provider, and customer or geographical area. (c) A statement of the period of time during which the interruption is authorized. The order may provide for a fixed duration or require that the government end the interruption when it determines that the interruption is no longer reasonably necessary because the danger that justified the interruption has abated. If the judicial officer finds that probable cause exists that a particular communication service is being used or will be used as part of a continuing criminal enterprise, the court may order the permanent termination of that service and require that the terminated service not be referred to another communication service. (d) A requirement that the government entity immediately serve notice on the service provider when the interruption is to cease.