Balko is all over the tragic story of yet another marijuana raid gone wrong:
As the SWAT team forced its way into his home, [Jose] Guerena, a former Marine who served two tours of duty in Iraq, armed himself with his AR-15 rifle and told his wife and son to hide in a closet. As the officers entered, Guerena confronted them from the far end of a long, dark hallway. The police opened fire, releasing more than 70 rounds in about 7 seconds, at least 60 of which struck Guerena. He was pronounced dead a little over an hour later.
The Pima County Sheriff's Department initially claimed (PDF) Guerena fired his weapon at the SWAT team. They now acknowledge that not only did he not fire, the safety on his gun was still activated when he was killed. Guerena had no prior criminal record, and the police found nothing illegal in his home.
A likely reason why Guerena was armed with a rifle: Two of his wife's relatives were murdered and their children shot by intruders last year.