D.C. Mun. Regs. tit. 5, r. 5-E2102
All students enrolled in an elementary, middle or junior high school shall be restricted to school grounds between the hours of 9 a.m. and 3:00 p.m. on days on which school is in session unless written parental request is made in advance for a student to leave school for one of the reasons set forth in § 2101.3.
Principals of senior high schools, in consultation with staff and the larger school community, as appropriate, may determine whether they will have a closed campus.
The Superintendent, at his or her discretion, may direct the closing of the campus at any senior high school.
If the decision is made to have a closed campus (pursuant to §§ 2102.2 or 2102.3), all students enrolled in that school shall be restricted to school grounds between the hours of 9 a.m. and 3 p.m., or, during the hours required by their instructional program (whichever is longer) on days on which school is in session, unless a written parental request is made in advance for a student to leave school for one of the reasons set forth in § 2101.3.
D.C. Mun. Regs. tit. 5, r. 5-E2102