[antris]

Yet companies turn a blind eye towards people who abuse alcohol, even throwing parties where people are encouraged to drink alcohol. If your chosen substance is alcohol, you can even be an alcoholic and still keep your job if it doesn't affect performance.

Every hire is full of risks. Nobody knows whether they'll get into a car crash, get cancer, or get shot, or become a substance abuser. Whether they admit their medical history or not. That's because they are human beings. Humans are inherently risky. If you want to eliminate risk, then hiring humans is not for you.

All you do by punishing people who are honest about their history, is to encourage even more people to lie in interviews. Those people are only the tip of the iceberg, and a significant number of people companies hire already have such history but they just keep their mouths shut.