District of Columbia v. Heller was historic, the first Supreme Court decision to clearly hold that the Second Amendment right to arms was an individual one not linked to militia service. But it was historic for another reason: the sheer number of mistakes made in the dissenters' opinions. Given that all four dissenters co-signed the Stevens and Breyer dissenting opinions, this means that the mistakes must have escaped, not only four members of the highest court in the land, but their sixteen research clerks! Case in point: Justice Stevens' dissent claims that he holds true to the Court's earlier, 1939,...