District of Columbia v. Heller (2008)
The Court struck down Washington, D.C.'s handgun ban, ruling the Second Amendment protects an individual right to keep and bear arms for self-defense. The majority tied protection to weapons 'in common use' for lawful purposes.
D.C.'s handgun ban fell, and the right was applied to the states two years later in McDonald v. Chicago.
Created the 'common use' test that now drives the fight over which arms get Second Amendment protection.
The 'common use' test is the battleground in Calce. New York City argues stun guns aren't in common use, while the petition says that test applies only after the plain text already covers the arms.
