Frequently Asked QuestionsDo you have to confirm a non-negative result? If so, how is this done? Posted on December 15, 2015December 10, 2020 by rapiddetectRapid Detect Inc. strongly recommends that a SAMHSA certified laboratory confirm all non-negative results. Please call us directly for assistance. rapiddetect Are there any substances that can be used in the tests to give a false negative? What can be done to avoid this?Is there specific training required to administer these drug tests?