In Alcohol Impairment, Robson Forensic bar and nightclub experts write that when when alcohol is identified as a factor in an injury incident, it is often assumed to be the only cause. Bars and lounges expert witnesses determine if alcohol played a causative or contributing role. Elizabeth A. Trendowski has been working in the liquor and hospitality industry for over twenty years and as an expert she evaluates the actions of establishments serving alcohol and addresses the standards of care in issues of underage drinking.