The case against Rockland bus driver Jeffrey Colburn, 65, of Camden, was downgraded to a civil violation after he was previously arrested on manslaughter charges after he allegedly struck and killed 12-year-old Brayden Callahan late last year. Rockland Police Chief Tim Carroll publicly disagreed with the district attorney’s assessment. “Given the thoroughness of our investigation, the findings of that investigation and the weight of what occurred, I personally believe that criminal charges were justified. Any questions on this charging decision, which rests solely with the Knox County District Attorney’s Office, should be referred to it,” he added. Callahan’s parents have also filed a lawsuit against both Colburn and the school district.