D.C. Code § 38-2001.18
The provisions of this subchapter shall not apply to any teacher who receives an annuity from any state or municipality other than the District of Columbia.
Jan. 15, 1920, 41 Stat. 390, ch. 39, § 18
June 11, 1926, 44 Stat. 731, ch. 556, § 1
1973 Ed., § 31-719.
1981 Ed., § 31-1218.