To 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 to the agent the content if the agent gives to the custodian:

1. (1)
   A written request for disclosure which is in physical or electronic form;
2. (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. (3)
   A certification by the agent, under penalty of perjury, that the power of attorney is in effect; and
4. (4)
   If requested by the custodian:

   1. (a)
      A number, username, address, or other unique subscriber or account identifier assigned by the custodian to identify the principal’s account; or
   2. (b)
      Evidence linking the account to the principal.