sentences:  Washington, D.C.'s gun laws are considered by many to be the strictest in the United States, and have been challenged as infringing on constitutional rights protected by the United States Constitution's Second Amendment.On March 9, 2007, portions of the law were declared unconstitutional by a three-judge panel of the United States Court of Appeals, in a 2-1 ruling in the case District of Columbia v. Heller.After the District's application for a rehearing en banc was denied, it appealed the decision to the Supreme Court of the United States.