Alcohol & drug abuse is common and can have serious health and behavioral effects. The alcohol & drug abuse expert witnesses on this list are treatment professionals that have extensive knowledge and experience dealing with and helping people who have alcohol & drug dependence. They may opine on drug dependence, chemical dependence, alcohol dependence, excessive drug use, prescription drug, illicit drugs, opioid addiction, DUI, DWI, marijuana, methamphetamine, and similar topics. In the event of a lawsuit, an alcohol & drug abuse expert witness may be asked to testify on related issues, including improper prescribing, overdose death, medical malpractice, and prescription drug abuse.