District of Columbia Code Division V. Local Business Affairs § 32-1364. Exemptions.

(a) Nothing set forth in this chapter shall be construed as prohibiting an employer or employment agency from publishing, in print, on the Internet, or in any other medium, an advertisement for any job vacancy that contains any provision setting forth any other qualifications for a job, as permitted by law, including:

(b) Nothing in this chapter is intended to preclude an employer or employment agency from examining the reasons underlying an individual's status as unemployed in assessing an individual's ability to perform a job or in otherwise making employment decisions about that individual.

(c) Nothing in this chapter shall be construed as prohibiting an employer or employment agency from publishing, in print, on the Internet, or in any other medium, an advertisement for any job vacancy that contains any provision stating that only applicants who are currently employed by the employer will be considered for employment.