Among other things, the employer was refusing to let truck drivers who had an alcohol problem and subsequently got cured go back to driving trucks.
You don't "get cured" of alcoholism, you just stop drinking. It could be for a day or it could be for life. In any case former alcoholics are much more likely to relapse than non-alcoholics are to become them in the first place.
I don't have an issue with "You must be healthy to do job X"--I bet NASA doesn't send astronauts into space if they need a quadruple bypass transplant. I do have an issue with "If you've ever been sick, you can't do job X ever again."
Why? Let's say this guy, while an alcoholic, had driven drunk and killed some people. Should we let him back on the job once his sentence has been served as long as he's been "cured?"
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"All video games being free is a human right." -Vlado [Evil Republican]
Play Der Langrisser.