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As states legalize medical or recreational marijuana, employers, employees and unions are asking how to keep people safe in the workplace. Some of them, including the Center for Occupational & Environmental Medicine in Western New York, are turning to Nellie Brown of Cornell University's ILR School.

"When I started looking at this, several things really jumped out at me," said Brown, a certified industrial hygienist and lead programs manager at The Worker Institute at Cornell University.