Where I come from, they wouldn't fire a bus driver who showed up at work in the morning smelling like booze, just tell him to go sleep it off. It's a shit job, nobody wants to do it. I do live in a wholly different country though, so bus drivers are paid shit despite being unionized as even with subsidies the bus routes in small towns aren't very profitable. Cities with people in them are a different story.

This is for regular bus routes, not school buses, we don't have those, schoolkids just take the same bus as everyone else.