Douglas Lewis, President and Scientific Director, discussed Phosphatidylethanol (PEth) in dried blood spots and Ethyl Glucuronide (EtG) in hair and fingernails. 

Douglas Lewis

President and Scientific Director

Douglas Lewis is the founder, president and scientific director of United States Drug Testing Laboratories, Inc. (USDTL) where he oversees development of new matrices for use in diagnosing substances of abuse, such as: umbilical cord tissue used to determine substance exposure in newborns, and fingernails to determine alcohol biomarkers and substances of abuse.