D.C. Code § 32-205
No minor under 18 years of age shall be employed, permitted, or suffered to work at operating any freight or nonautomatic elevator, or in any quarry, tunnel, or excavation.
May 29, 1928, 45 Stat. 999, ch. 908, § 5
June 15, 1976, D.C. Law 1-68, § 2(5), 23 DCR 514
1973 Ed., § 36-205.
1981 Ed., § 36-505.