APA: Drug Test Results Often Flawed

-NEW ORLEANS — Poppy seeds can indeed result in a false positive on a drug test, researchers said here.

by Kristina Fiore, Staff Writer, MedPage Today (2010-05-23)


As far as false-negatives go, Smith said physicians should be wary of the methods for diluting samples used in drug tests — an issue he calls “the elephant in the room.”

On average, such strategies appear to work 50% of the time. These include bleaching urine or adding the household cleaner Drano or the eye lubricant Visine to it.


Review. American Journal of Clinical Pathology. 2007 Sep;128(3):491-503. doi: 10.1309/FQY06F8XKTQPM149.

The effects of adulterants and selected ingested compounds on drugs-of-abuse testing in urine

Amitava Dasgupta 
The Department of Pathology and Laboratory Medicine, University of Texas Health Sciences Center, Houston, TX 77030, USA.