District of Columbia Code Division VIII. General Laws. § 48-1004. Prohibition.

(1) The conduct of a person being observed, including that such person is behaving in a manner raising a reasonable belief that the person is engaging or is about to engage in illegal drug activity, such as the observable distribution of small packages to other persons, the receipt of currency for the exchange of a small package, operating as a lookout, warning others of the arrival of police, concealing himself or herself or any object which reasonably may be connected to unlawful drug-related activity, or engaging in any other conduct normally associated by law enforcement agencies with the illegal distribution or possession of drugs;

(2) Information from a reliable source indicating that a person being observed routinely distributes illegal drugs within the drug free zone;

(3) Information from a reliable source indicating that the person being observed is currently engaging in illegal drug-related activity within the drug free zone;

(4) Such person is physically identified by the officer as a member of a gang or association which engages in illegal drug activity;

(5) Such person is a known unlawful drug user, possessor, or seller;

(6) Such person has no other apparent lawful reason for congregating in the drug free zone, such as waiting for a bus, being near one's own residence, or waiting to receive medical or social services;

(7) Any vehicle involved in the observed circumstances is registered to a known unlawful drug user, possessor, or seller, or a person for whom there is an outstanding arrest warrant for a crime involving drug related activity.