Can Hair be affected by cross-reacting substances such as over-the-counter medications and would that effect hair drug testing results?

Enzyme-immunoassay antibodies (EIA), similar to those used to test urine for drug, are used for the initial screening test for drugs of abuse in hair; therefore the potential for substances such as over-the-counter medications to cause a false positive screening result does exist to some degree.

To eliminate the possibility of reporting a false-positive due to cross-reactivity, TestCountry utilizes hair drug testing laboratories that confirm all positive results by GC/MS for methamphetamine, opiates, PCP, cocaine and marijuana



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