District of Columbia v. Heller

The District (defendant) denied Heller (plaintiff), a special police officer, a registration certificate for a handgun he wished to keep at home under a law banning handgun possession without a license and requiring any lawfully owned handgun to be rendered inoperable via trigger-lock; the district court dismissed Heller's suit, but the D.C. Circuit reversed, finding the Second Amendment protects an individual right to bear arms.