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If your on a controlled substance, but you have a valid rx for it, the employer would just be told you passed after the testing company confirm your rx is legit?
They do this because of HIPAA. If you test positive for codeine while you're taking a prescribed dose of Cheratussin AC for a cough, the drug testing company will be the one to contact you and tell you about the positive result. Once you clear it up with them, it gets returned to the employer as "passed".