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“In the nation’s capital, carrying is perhaps the greatest concern to law enforcement because it makes it very hard for law enforcement to distinguish between a person who is carrying a firearm legally and a potential assassin,” he said.

The Supreme Court ruled in June 2008 that the city’s near-total ban on handguns was unconstitutional and that residents should be allowed to keep guns in their homes for personal protection.

City officials began rewriting the laws immediately after the decision. The new laws still forbid semiautomatic and other high-powered weapons.

Mr. Gura filed another lawsuit in March, arguing that a roster of handguns deemed acceptable for registration was restrictive. The lawsuit was dropped when the D.C. government in June expanded its list of guns that residents could seek to register.