Even though legalization of marijuana is expected to take effect Thursday in the District, parts of D.C. are still under federal jurisdiction. National parks, military property and other land controlled by the federal government totals about 18 square miles in the District, 29 percent of the city's total land area. Federal law enforcement officers may still arrest people possessing marijuana in these and other areas, such as public housing projects. Read related story.

• National parks
• Other federal land