Slate writes, In the 18th century, the word deadline described the point, a certain number of feet from a prison building, at which guards could shoot escaping prisoners. Today, deadlines still carry potentially fatal consequences, as two Supreme Court cases being argued Monday demonstrate. In McQuiggin v. Perkins and Trevino v. Thaler, two defendants are fighting for the chance to present evidence that could call into question their convictions, even though they have both missed deadlines to make their claims.