Officials say Wynn was a substitute bus driver for Cumberland County Schools and was also employed as a night custodian at 71st High School.
Last week, Wynn was driving students home from Lewis Chapel Middle School when a 1998 Ford Expedition rear-ended the bus after it stopped on Pritchett Road near Cliffdale Road.
Eighteen students were on board bus 511 at the time of the crash. One student from the bus and a child from the SUV were transported to Cape Fear Valley Medical Center with non-life threatening injuries. Three other students were later taken to the hospital by parents.
Officials say the driver of the SUV was determined to be at fault. However while at the scene, police say they smelled alcohol on Wynn's breath and issued a field sobriety test. He blew a 0.20 -- well over the legal limit of 0.08.
Wynn was charged with driving while subject to impairing substance, operating a school bus after consuming alcohol and driving while impaired while operating a commercial vehicle.