Forty-eight years after he was convicted of rape, DNA evidence has exonerated Leonard Mack. Westchester, New York, District Attorney Mimi Rocah apologized to Mack, who spent seven years in prison, for the "incalculable damage and the collateral consequences" that the false conviction brought. The rape victim, and a friend who was with her but escaped, told police the attacker was a black man with an earring wearing a brimmed hat. Cops found Mack…