District of Columbia Code Division V. Local Business Affairs § 32-951.03. Rules of construction.

(A) Requires post-accident or reasonable suspicion drug testing of employees for cannabis or other drugs or drug testing of employees in safety sensitive positions;

(B) Is necessary to comply with federal law, including Chapter 81 of Title 41 of the United States Code (41 U.S.C. § 8101 et seq.), or a federal contract or funding agreement, if applicable to the employer;

(C) Prohibits the use, consumption, possession, storage, delivery, transfer, display, transportation, sale, purchase, or growing of cannabis at the employee's place of employment while performing work for the employer or during the employee's hours of work, unless otherwise permitted pursuant to § 2-1402.11(b-1) or § 1-620.62; or

(D) Prohibits employees from being impaired at the employee's place of employment while performing work for the employer or during the employee's hours of work, as described in § 32-591.02(b)(4);