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ADVANCE FOR USE MONDAY, DEC. 14 - In this photo taken Nov. 23, 2015,, St. Cloud State University professor Heiko Schoenfuss talks in the school's aquatic toxicology lab in St. Cloud, Minn., about the ongoing study that observes the effects of common pharmaceuticals and chemicals in water on fathead minnows. (Kimm Anderson/St. Cloud Times via AP)  NO SALES; MANDATORY CREDIT

ADVANCE FOR USE MONDAY, DEC. 14 - In this photo taken Nov. 23, 2015,, St. Cloud State University professor Heiko Schoenfuss talks in the school's aquatic toxicology lab in St. Cloud, Minn., about the ongoing study that observes the effects of common pharmaceuticals and chemicals in water on fathead minnows. (Kimm Anderson/St. Cloud Times via AP) NO SALES; MANDATORY CREDIT

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