Prosecutors’ primary evidence against MacColl was microscopic comparisons of the gun he submitted to his departmental supervisors hours after the shooting and the shell casings and bullets recovered from the scene.
Forensic experts determined that the shell casings were fired by the gun MacColl turned in, but the bullets could not have traveled through the barrel of that weapon. In an interview with department supervisors the month of the shooting, MacColl denied tampering with the weapon, according to court evidence.
