Drug and Alcohol Testing Q&A - 2008

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Invalid - Excess foaming and precipitate

From: Dr. F
Password: orange
Date: 21 Feb 2008
Time: 12:24:46 -0800
Remote Name: 207.30.22.138

Comments

Non-NIDA post-job offer drug test result was reported as negative, then amended -- "Invalid result; Abnormal physical characteristics; excessive foaming; foreign material present."  I spoke with the lab scientist and was told that the foreign material was a "white precipitate."  I spoke with the donor, and he admits to taking Tramadol, Naproxyn, and aspirin.  I know aspirin can cause an invalid, but not sure what to make of foaming or precipitate?  Advice, please?