Fingernails, like hair, are made of the protein keratin and are tested with the same process. The method of screening for drug use in a fingernail test is the five panel, Enzyme Multiple Immunoassay Test (EMIT). The fingernail is put in a chemical solution to rid the nail of external contaminants and is then liquified. Results of a fingernail sample will represent drug use that is approximately 4-5 months from the time of ingestion. Fingernails can be clipped.
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