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| Name | Current message text |
|---|---|
| h English (en) | The [[Duquenois–Levine test]] is commonly used as a [[Presumptive and confirmatory tests|screening test]] in the field, but it cannot definitively confirm the presence of cannabis, as a large range of substances have been shown to give false positives. Researchers at John Jay College of Criminal Justice reported that dietary zinc supplements can mask the presence of THC and other drugs in urine. However, a 2013 study conducted by researchers at the [[University of Utah School of Medicine]] refute the possibility of self-administered zinc producing false-negative urine drug tests. |