Are there any disadvantages of EtG Test?
This test doesn't bother to find out why and how the ETG has been produced or the identity of the real substance which has been metabolized to produce ETG. If it detects ETG, it will simply label person who took the test as an inebriate! Moreover, there are no known threshold levels determined for ETG that can distinguish between the incidental exposure and the intentional consumption of alcohol. So certainly, there can be some false positives.
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Disadvantages of EtG test False positives Threshhold limit Back To Alcohol FAQ