I have 29 years of experience, and specialize in the field of addiction medicine and drug testing with specific knowledge in the areas of EtG (ethyl glucuronide) and EtS (ethylsulfate) testing, alcohol and drug testing and monitoring. I have published on such topics as drug testing and alcohol markers, professional health and monitoring. I have testified 28 times on topics such as drug testing, professional impairment and addiction. I have more experience in the area of alcohol monitoring, EtG (ethylglucuronide) and EtS (ethylsulfate) testing professional impairment, addiction among professionals, interventions, and evaluations of professionals than any other physician in the USA.