It’s 9:45 a.m. and William Tyke Redfearn is walking the halls of Camden Elementary School (CES) with a small portable two-way radio in his hand. Redfearn’s just conducted a perimeter check of the school; everything’s fine. About two hours earlier he assisted teachers with meeting students in the drop-off line, making sure traffic flowed smoothly into and out of the car rider line off Lyttleton Street.