D.C. Code § 21-521
An accredited officer or agent of the Department of Mental Health of the District of Columbia, or an officer authorized to make arrests in the District of Columbia, or a physician or qualified psychologist of the person in question, who has reason to believe that a person is mentally ill and, because of the illness, is likely to injure himself or others if he is not immediately detained may, without a warrant, take the person into custody, transport him to a public or private hospital, or to the Department, and make application for his admission thereto for purposes of emergency observation and diagnosis. The application shall reveal the circumstances under which the person was taken into custody and the reasons therefor.
D.C. Code § 21-521
Annulment of marriage, § 46-404 . Condemnation of insanitary buildings, appointment of guardian ad litem, see § 6-909 . Conservator, guardian in proceedings for appointment, see § 21-2041 et seq. Emergency disclosure of mental health information, see § 7-1203.03 . Militia service exemption, see § 49-401 . Personal property schedule filing, persons under disability, see § 47-1601 . Physician or qualified psychologist related by blood or marriage to alleged mentally ill person, power to apply or certify mental status, see § 21-582 . Property of mentally ill persons, see § 21-2001 et seq. Real estate leases, mentally ill person's rights, see § 42-3222 et seq. Redemption from tax sale, removal of disability, see § 47-1304 . Release of dower, see § 19-107 a. St. Elizabeths Hospital, commitment of mentally ill persons, see §§ 21-901 et seq., 44-901 et seq. .