District of Columbia Code Division VIII. General Laws. § 47-2836. Guides.

(a) No person shall, for hire, guide or escort any person through or about the District of Columbia, or any part thereof, unless he shall have first secured a license so to do. The fee for each such license shall be $28 per annum. No license shall be issued hereunder without the approval of the Chief of Police. The Council of the District of Columbia is authorized and empowered to make reasonable regulations for the examination of all applicants for such licenses and for the government and conduct of persons licensed hereunder, including the power to require said persons to wear a badge while engaged in their calling.

(b) Any license issued pursuant to this section shall be issued as a General Services and Repair endorsement to a basic business license under the basic business license system as set forth in subchapter I-A of this chapter.