Study finds people using the drug are causing large quantities to leak into the sea.
Thirteen Brazilian sharpnose sharks caught off Rio de Janeiro have tested positive for cocaine, marine biologists who carried out the tests have reported.
High concentrations of cocaine were found in the sharks’ muscles and livers by researchers at the Rio de Janeiro-based Oswaldo Cruz Foundation.
Benzoylecgonine was also detected in the same sharks. Benzoylecgonine is one of the byproducts produced when cocaine is consumed.
What did the study find?
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