Gwinnett County Public Schools bus drivers Cindy Johnston, Sandy Purcell and Dee Walls always thought if they ever had to use CPR during work hours, it would be to save a student.

“All the drivers here are (CPR) certified for the kids on the bus, so that’s where you think you’re going to use it,” Johnston said. “You think maybe even a student in a class — you don’t think you’re going to use it on a coworker.”