School shooter convicted again - 10 years later

• Story Highlights
• Mitchell Johnson, now 23, was 13 when he killed 4 classmates and a teacher
  
• He and another boy went to juvenile detention until they turned 21
  
• On Jan. 1 police stopped Mitchell, found drugs, pistol, 20-gauge shotgun
  
• Government lawyers did not bring up Mitchell's past at recent trial
  
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