2023 California Code › Penal Code - PEN › PART 2 - OF CRIMINAL PROCEDURE › TITLE 12 - OF SPECIAL PROCEEDINGS OF A CRIMINAL NATURE › CHAPTER 3.6 - Electronic Communications Privacy Act › Section 1546.2.

1546.2. (a) (1) Except as otherwise provided in this section, any government entity that executes a warrant, or obtains electronic information in an emergency pursuant to Section 1546.1, shall serve upon, or deliver to by registered or first-class mail, electronic mail, or other means reasonably calculated to be effective, the identified targets of the warrant or emergency access, a notice that informs the recipient that information about the recipient has been compelled or obtained, and states with reasonable specificity the nature of the government investigation under which the information is sought. The notice shall include a copy of the warrant or a written statement setting forth facts giving rise to the emergency. The notice shall be provided contemporaneously with the execution of a warrant, or, in the case of an emergency, within three court days after obtaining the electronic information.
(2) Notwithstanding paragraph (1), notice is not required if the government entity accesses information concerning the location or the telephone number of an electronic device in order to respond to an emergency 911 call from that device.
(b) (1) When a warrant is sought or electronic information is obtained in an emergency under Section 1546.1, the government entity may submit a request supported by a sworn affidavit for an order delaying notification and prohibiting any party providing information from notifying any other party that information has been sought. The court shall issue the order if the court determines that there is reason to believe that notification may have an adverse result, but only for the period of time that the court finds there is reason to believe that the notification may have that adverse result, and not to exceed 90 days.
(2) The court may grant extensions of the delay of up to 90 days each on the same grounds as provided in paragraph (1).
(3) Upon expiration of the period of delay of the notification, the government entity shall serve upon, or deliver to by registered or first-class mail, electronic mail, or other means reasonably calculated to be effective as specified by the court issuing the order authorizing delayed notification, the identified targets of the warrant or emergency access, a document that includes the information described in subdivision (a), a copy of all electronic information obtained or a summary of that information, including, at a minimum, the number and types of records disclosed, the date and time when the earliest and latest records were created, and a statement of the grounds for the court’s determination to grant a delay in notifying the individual.
(c) If there is no identified target of a warrant or emergency access at the time of its issuance, the government entity shall submit to the Department of Justice within three days of the execution of the warrant or issuance of the request all of the information required in subdivision (a). If an order delaying notice is obtained pursuant to subdivision (b), the government entity shall submit to the department upon the expiration of the period of delay of the notification all of the information required in paragraph (3) of subdivision (b). The department shall publish all those reports on its Internet Web site within 90 days of receipt. The department may redact names or other personal identifying information from the reports.
(d) Except as otherwise provided in this section, nothing in this chapter shall prohibit or limit a service provider or any other party from disclosing information about any request or demand for electronic information.
(Amended by Stats. 2017, Ch. 269, Sec. 10. (SB 811) Effective January 1, 2018.)