Employers can't be with their employees 24/7, but they can observe workers' appearances and behaviors to watch for any red flags.

Following are some signs of substance abuse from www.drugfree.org that employers should keep in mind:

• Bloodshot eyes or pupils that are larger or smaller than usual
• Slurred or agitated speech
• Sudden or dramatic weight loss or gain
• Skin abrasions or bruises
• Neglected appearance or poor hygiene
• Frequently calling in sick or missing work
• Accidents or injuries
• Emotional instability or unexplained changes in personality
• Hyperactive or extremely aggressive behavior
• Depression
• Failing to fulfill work responsibilities
• Complaints from co-workers
• Reports of intoxication at work
• Avoiding eye contact
• Unusual smells on clothing or breath
• Disappearing for long periods of time

This Web exclusive information is a supplement to A safer workplace.