While you can dispute the results with the employer, there is nothing that requires them to allow you to resubmit to testing.
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Recourse to take a retest no. If I were you I would be forthright and speak with the employer and admit that you take anti anxiety medication and say that you believe it is a false positive. I am hoping that this is the legitimate reason and you are not hoping for a different result due to the longer absence of not taking the drug.