Substance abuse in the workplace is a major concern for employers. But, how can you tell if an employee has a problem with drugs or alcohol? Following are signs that an employee may have a substance abuse problem:

Results from a national survey of more than 1,000 human resource professionals nationwide found that 67% consider addiction and substance abuse to be among the most serious problems in the workplace. Released by the nonprofit Hazelden Foundation, the survey also showed that employer policies and practices are not fully addressing the problem. Only 22% of the HR professionals surveyed say their companies openly and proactively deal with employee addiction and substance abuse issues.