(a) A person who receives an annuity under this subtitle may, on a form prescribed by and filed with the retirement system, authorize the retirement system to deduct from the person's monthly annuity payment the amount of a fee for the person's membership in a state employee organization that:
(1) is a certified eligible state employee organization under Section 403.0165; or
(2) has at least 2,500 retirees as members on January 1 preceding the fiscal year for which the deduction is made.
(b) An authorization made under this section remains in effect until:
(1) the person who receives the annuity modifies or revokes the authorization; or
(2) the state employee organization fails to meet the requirements of Subsection (a).
(c) The retirement system shall adopt rules to administer this section.