AFAIK they've never vaped on the bus with kids aboard, they do it when it's empty or parked. I have seen them many times using their phones with kids aboard, though. There's one driver that I never saw without her phone in one hand when I passed her; she was friends with the old transportation director so she was able to get away with anything, although the new director I think is trying to get rid of her. This driver hit two cars in one day and somehow still has her job.