Will employers discriminate with a new hire when he tells them his Atripla may give a false?

You might want to see if you can get some sort of statement to this effect from your Dr. They will be more likely to believe something coming from your medical doctor that warns there is a possibility for false positives with this medication. If your Dr is unwilling to do so then it is at the descretion of the company and I would think it would vary depending on the company. It depends on their knowledge of the medication and if they have experienced false positives in the past. Here is what the company literature has to say: Cannabinoid Test Interaction: Efavirenz does not bind to cannabinoid receptors. False-positive urine cannabinoid test results have been observed in non-HIV-infected volunteers receiving efavirenz when the Microgenics Cedia DAU Multi-Level THC assay was used for screening. Negative results were obtained when more specific confirmatory testing was performed with gas chromatography/mass spectrometry.

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For more information, please consult the SUSTIVA prescribing information.

I would ask the company to test your urine using a GC/MS if they come up with a false positive.