D.C. Code § 22-2603.04
§ 22-2603.04. Detainment power.
Any person who, being lawfully upon the grounds of the penal institution, introduces or attempts to introduce contraband prohibited by § 22-2603.02(a) may be taken into custody by the warden and detained for not more than 2 hours, pending surrender to a police officer with the Metropolitan Police Department.