50 U.S. Code § 1813 - Procedures for the retention of incidentally acquired communications
The term “covered communication” means any nonpublic telephone or electronic communication acquired without the consent of a person who is a party to the communication, including communications in electronic storage.
Not later than 2 years after December 19, 2014, each head of an element of the intelligence community shall adopt procedures approved by the Attorney General for such element that ensure compliance with the requirements of paragraph (3).
The procedures required by paragraph (1) shall apply to any intelligence collection activity not otherwise authorized by court order (including an order or certification issued by a court established under subsection (a) or (b) of section 1803 of this title), subpoena, or similar legal process that is reasonably anticipated to result in the acquisition of a covered communication to or from a United States person and shall permit the acquisition, retention, and dissemination of covered communications subject to the limitation in subparagraph (B).
Section was enacted as part of the Intelligence Authorization Act for Fiscal Year 2015, and not as part of the Foreign Intelligence Surveillance Act of 1978 which comprises this chapter.