Drug and Alcohol Testing Q&A - 2007

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Why did donor who admits to use test negative?

From: jckupfer@comcast.net
Password: orange
Date: 16 Dec 2007
Time: 07:33:18 -0800
Remote Name: 71.238.178.106

Comments

I understand that the EtG is highly sensitive and can produce false-positive results at times due to exposure to certain household products.

If someone admitted to drinking 2-3 beers 2-3 days before the test was administered and the window for testing positive is 80 hours, how could you explain a negative test result?