Photo by: Mark Simons This handout photo provided by Purdue University shows David Nichols in a lab at the university in West Lafayette, Ind., Wednesday, Jan. 5, 2011. Nichols studies the way psychedelic drugs act in the brains of rats. But he's haunted by how his work is being hijacked by humans selling street drugs. (AP Photo/Purdue University, Mark Simons)
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