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Imagine discovering that one of your employees has been stealing prescription drugs from work to support a substance abuse habit that you never even suspected. Sound unlikely? Think again. "It's a humongous problem," says Sheila Dunn, DA, MT (ASCP), founder and president of Quality America, Inc., an Asheville, NC-based company that sells Occupational Safety and Health Administration manuals and training programs to medical facilities. The American Journal of Public Health estimates that one in 12 nurses in the United States has an alcohol or drug problem severe enough to affect his or her practice.