Comment by chadash

It seems like it is permissible. The question is whether it is right. In the US at least, employment is generally at-will, meaning they can fire you for basically any reason as long as it isn't discrimination of a protected class. If my employer decided tomorrow to fire anyone who doesn't vote Republican, they can do that. I think it would be unreasonable, but it would be permissable, regardless of whether i had to disclose this going in. But this isn't quite that extreme. Presumably, this is them making a decision based on what they believe is in the best interests for the safety of their overall workforce. Why shouldn't employers be allowed to make decisions that they believe keep employees safe?