Should someone be allowed to take something that will drive them into a rage and potentially cause them to break into my home?
Ever heard of caffeine? Ever heard of 'roid rage? When was the last time you heard of marijuana inducing rage? I've got news for you: The movie "Reefer Madness" was all made up.
There's a [i]slight[/i] difference between your employer catching you doing substances (which may effect your performance on the job), and trying to dictate how you behave outside the workplace when you're doing nothing illegal.
There are a lot of things outside of the workplace that "may" affect your performance on the job including your diet, your personal relationships and how much sleep and exercise you get. That reasoning would support employers intruding into these areas as well.
As for the legality bit, remember that under US law people are supposed to be considered innocent until proved guilty by a competent court of law. A drug testing lab is not a competent court of law so failing a drug test does not mean a person is guilty of a crime. So while a person can be fired for failing a drug test, that cannot be rightfully extended to say that they doing something illegal (without a court determination to that effect).
Frankly, if I'm having to follow someone else's code of conduct 24hrs a day, I expect to be compensated for it 24hrs a day.
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As for the legality bit, remember that under US law people are supposed to be considered innocent until proved guilty by a competent court of law. A drug testing lab is not a competent court of law so failing a drug test does not mean a person is guilty of a crime. So while a person can be fired for failing a drug test, that cannot be rightfully extended to say that they doing something illegal (without a court determination to that effect). Then you may be disappointed.