Substance abuse is a major public health concern in the United States. In fact, the National Institute on Alcohol Abuse and Alcoholism estimates that 10% of the population has a problem with alcohol. In addition, 17.9 million adult Americans are current illicit drug users. Although historically, drug and alcohol abuse has not been seen as an issue that needed to be addressed in the workplace, more recently, this line of thinking has changed because of the negative effects on both the individual and the workplace. The National Institute on Drug Abuse reports approximately 75% of illegal drug users are working. In addition to their own struggles, workers who use alcohol or other drugs may have a deleterious impact on other employees and affect employee health, ...