D.C. Code § 34-605
Former § ,43-910 1981 Ed., 49 Stat. 885, ch. 742, § ,4, provided that if any provision this section or the application to any person or circumstances is held invalid, the invalidity of the remainder of said sections and of the application of such provision to other persons and circumstances shall not be affected thereby.
Investigations of public utilities, assessing expenses, see § 34-912. .