School Bus Drivers and DWI

A New Jersey school bus driver was arrested yesterday after crashing into a tree in East Brunswick , accused of driving while intoxicated.  This is not the first time we hear about school bus drivers driving while intoxicated.  How do they get behind the wheel to begin with?  Granted if a driver doesn't have a DUI on his or record, there is no reason to believe they will get a DUI....but then again, there is no reason to think they WILL NOT get a DUI either.  And it is impossible to keep constant eye on all drivers before they get behind the wheel.  Or is it?

In certain circumstances Courts in NJ have ordered interlocatory devices be installed on the vehciles of repeat offenders to make sure they are unable to turn the car on if they are drunk.  The devices are not too expensive, but they do save lives.  It only makes sense that they be installed in all school buses to make sure that no driver will operate a school bus while drunk, endangering the lives of the children on the bus or people on the road.