Brazil sharks are being exposed to cocaine. This finding raises concerns about human pollution affecting marine life.
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Brazil's Oswaldo Cruz Foundation found cocaine in the muscles and livers of 13 sharpnose sharks near Rio de Janeiro.
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Narcotraffickers dump cocaine overboard, researchers believe wastewater contamination from human use and illegal refining labs is more likely the cause.
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Cocaine could cause hyperactive behavior in sharks. More research is needed to understand the full impact on their health and behavior.
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This discovery adds to growing evidence of marine life being affected by recreational drugs. In the UK, eels exposed to cocaine had difficulty mating.