The federal sentencing of three ex-Atlanta police officers for the illegal drug raid that left a 92-year-old woman dead closes only one chapter in the tragic case, the Atlanta Police Department said Wednesday. ... Carnes imposed the most severe sentence — 10 years — on Smith, 36, who obtained the illegal, no-knock search warrant allowing officers to batter down Johnston’s door. A terrified Johnston, thinking she was victimized by a home invasion, fired a warning shot through the door. Narcotics officers responded with a hail of gunfire, killing her. ...