Can over-the-counter medications produce positive results in a hair test?
Enzymes-immunoassay antibodies (EIA), similar to those used to test urine, 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 eliminate the possibility of reporting a false-positive due to cross-reactivity, Trimega Laboratories confirms all positive results by GC/MS for methamphetamine, opiates, PCP, cocaine and cannabis.
