Section 3559 - Disclosure of content of electronic communications of principalTo the extent a power of attorney expressly grants an agent authority over the content of electronic communications sent or received by the principal, and unless directed otherwise by the principal or the court, a custodian shall disclose the content of the electronic communication to the agent if the agent gives the custodian:
(1) a written request for disclosure in physical or electronic form;(2) an original or copy of the power of attorney expressly granting the agent authority over the content of electronic communications of the principal;(3) a certification by the agent, under penalty of perjury, that the power of attorney is in effect; and(4) if requested by the custodian:(A) a number, username, address, or other unique subscriber or account identifier assigned by the custodian to identify the principal's account; or(B) evidence linking the account to the principal.