D.C. Code § 38-2021.17

Except as provided in subchapter VI of Chapter 5 of Title 1 (§ 1-529.01 et seq.), none of the money mentioned in this part, including any assets of the District of Columbia Teachers’ Retirement Fund established by § 1-713(a), shall be assignable, either in law or equity, or be subject to execution or levy by attachment, garnishment, or other legal process, except with respect to a domestic relations order that substantially meets all of the requirements of section 414(p) of the Internal Revenue Code , as determined solely by the District of Columbia Retirement Board.