Scientists with the Oswaldo Cruz Foundation tested 13 Brazilian sharpnose sharks who all tested positive for the drug, and 12 out of the 13 also tested positive for benzoylecgonine, cocaine’s primary metabolite.
The highest concentrations of the drug were found in its muscle tissue, but some were also found in their livers with concentrations as much as 100 times higher than those found in other marine animals.
https://www.fox10phoenix.com/news/sharks-test-positive-cocaine-off-brazils-coast