My understanding's that amphetamines are immunosuppressive... Theoretically, couldn't these drugs result in false negatives?
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Welcome to Health.SE! To avoid having your question downvoted, put on hold, or closed, make sure to follow the guidelines for asking questions. Please see: How do I ask a good question? and Help Center > Asking. Thanks!– Mark D Worthen PsyDCommented Jul 24, 2017 at 13:52
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