FAYETTEVILLE, Arkansas — A federal jury convicted a 23-year-old man on an obscure weapons charge Tuesday, apparently unaware that 10 years ago he and another boy killed four classmates and a teacher in a schoolyard ambush. Mitchell Johnson faces 10 years in prison and a $250,000 fine when he is sentenced in the next 45 days on a count of possessing a firearm while being a drug user. Through his attorney, Johnson declined to comment Tuesday. Johnson was arrested on... (GunPolicy.org)