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WASHINGTON, DC - JULY 7:  A pouch of dried herbal potpourri being called "synthetic marijuana", photographed at The Washington Post via Getty Images in Washington, DC on July 7, 2010.  One gram bags of the herbal mix are labeled warning the product is "not for human consumption" and to "burn in a well ventilated area." (Photo by Wendy Galietta/The Washington Post via Getty Images)
WASHINGTON, DC - JULY 7:  A pouch of dried herbal potpourri being called "synthetic marijuana", photographed at The Washington Post via Getty Images in Washington, DC on July 7, 2010.  One gram bags of the herbal mix are labeled warning the product is "not for human consumption" and to "burn in a well ventilated area." (Photo by Wendy Galietta/The Washington Post via Getty Images)

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    Outbreak linked to synthetic pot

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Outbreak linked to synthetic pot

An outbreak is linked to synthetic marijuana in Colorado as health officials work to determine what is in it.

Outbreak linked to synthetic pot

An outbreak is linked to synthetic marijuana in Colorado as health officials work to determine what is in it.