The Second Amendment gives people the right to keep and bear arms. To create a law that bans people from having possession of firearms would violate the second amendment and be unconstitutional.
Court Case: McDonald v. City of Chicago Date: 6/28/10
McDonald v. Chicago involved a 2nd Amendment challenge to a Chicago law that banned private handgun ownership in the city.
The Court ruled in favor of McDonald, saying that the law banning private handgun ownership violates the second amendment to bear arms.