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Most states and the District of Columbia have shield laws providing varying degrees of protection from forced disclosure . Maryland , Pennsylvania , Virginia , the District of Columbia , and the federal government and the Chesapeake Bay Commission voluntarily participate in the agreement . At least 13 states and the District of Columbia supplement the federal Head Start program for preschoolers , which includes specific quality components . Applicants for the regional meeting in Kansas City must live in Iowa , Kansas , Missouri or Nebraska ; applicants for the meeting in Denver must live in Colorado , Montana , North Dakota , South Dakota , Utah or Wyoming ; and applicants for the meeting in Philadelphia must live in Delaware , Maryland , Pennsylvania , Virginia , West Virginia or the District of Columbia . In a win for Internet service providers ( ISPs ) that were forced to reveal identities of customers accused of music piracy , a U.S. Court of Appeals for the District of Columbia has struck down a lower-court ruling on the issue .