Im not a doctor, I have to follow HIPPA and I can get in big time trouble if I let PII leak. PII is confidential and the property of the patient. Without a release, without your consent, no one can see it.

If you ask an employee if they have been seen for substance abuse and they say no, you can't then demand proof. When I tell my boss I have a doctors appointment, they never ask what for, because I don't have to willingly give that information.