Can hair be affected by cross-reacting with substances such as over the counter drugs?
Used A: antibody enzyme immunoassay (EIA), similar to urine tests for detection of initial drug used in the hair, so the potential for substances such as over-the-counter medications lead to a false-positive screening is not available. To eliminate the possibility of reporting a false positive result due to cross-reactivity that leads our laboratory gas chromatography / mass spectrometry (GC / MS) for all specimens, the positive points of the screen.
