I Need A Lawyer

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Saw this notice of non-discrimination policy at a construction site at Union Station as we returned from the March4Life yesterday. Can anyone tell me what the emphasized text refers to?

The District of Columbia does not discriminate on the basis of actual or perceived: race, color, religion, national origin, sex, age, marital status, personal appearance, familial status, family responsibilities, matriculation, political affiliation, genetic information, disability, source of income, status as a victim of an intrafamily offense, or place of residence or business.  Sexual harassment is a form of sex discrimination which is prohibited by the Act.  In addition, harassment based on any of the above protected categories is prohibited by the Act.

Wha?