The Role of Drugs in Workplace Injuries: Is Drug Testing Appropriate?

In the past decade, many employers have adopted drug-testing programs to reduce workplace injuries. However, little scientific evidence shows that drug use is a significant and substantial cause of total workplace injuries. The purpose of this study was to empirically assess the role of drugs and alcohol in causing workplace injuries. Questionnaires were received from 882 Ontario employees in a household survey. Results showed that many variables were significantly related to job injuries. The variables were ranked according to the relative importance of each variable's contribution to total job injuries. Alcohol problems, licit drug use, and illicit drug use ranked 7, 11, and 12 respectively among a group of 12 significant variables. In order to examine the likelihood that drug use was a cause of job injuries, the relationship between job injuries and alcohol problems, licit drug use, and illicit drug use was examined across categories of third variables. For age, the relationship between drug use and injuries remained strong for the youngest age group, but disappeared for the oldest age group. Logistic regression analysis confirmed the plausibility of noncausal explanations of job injuries for illicit drug use, but not for alcohol problems or licit drug use. Overall, the results indicated that illicit drug use does not appear to be a major cause of job injuries. The implications of these results for drug-testing programs are discussed.