In this photo made Friday, Nov. 11, 2016, firefighters and medics try to help a man onto a stretcher after he was found semiconscious on the ground in St. Louis. The man is believed to be one of several hundred who have become ill recently in St. Louis after possibly using a latest version of synthetic marijuana, a man-made hallucinogen that experts believe is far more dangerous and unpredictable than the real thing. (David Carson/St. Louis Post-Dispatch via AP)
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