You are delusional to think you cannot detect in advance but can tell AFTER an accident that it was causal.
Delusional? I think not. Once again, a man of little intelligence attacks the messenger when he can't have a discussion on a high level. Just because you do not agree with me does not make it do.
The issue is not detecting it after an event. It is safety and prevention.
Currently, the dilemma in CA and CO is can you even test a physician, pilot, or truck driver anymore. The State does not have a right, but under federal law, they still continue to test for safety reasons. It is legal nationwide. Prevention will be an issue.
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