D.C. Code § 50-381: Metered taxicabs in the District of Columbia.

(a)

Except as provided in subsection (b) of this section and not later than 1 year after October 16, 2006, the District of Columbia shall require all taxicabs licensed in the District of Columbia to charge fares by a metered system; provided that a company that uses digital dispatch for taxicabs may charge fares pursuant to § 50-301.31(b)(1).

(b)

The Mayor of the District of Columbia may exempt the District of Columbia from the requirement under subsection (a) of this section by issuing an executive order that specifically states that the District of Columbia opts out of the requirement to implement a metered fare system for taxicabs.