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Sharks in the Bahamas have tested positive for cocaine and painkillers for the first time ever, as well as a number of pharmaceutical drugs, according to a new scientific study.
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Some fish in the Bahamas are experiencing a different kind of spring break—whether they want to or not.
Sharks in the waters surrounding a remote area of the tropical island have tested positive for cocaine, caffeine and pharmaceutical drugs, a new study in the May 2026 issue of Environmental Pollution found.
Of the 85 sharks representing five species analyzed in "Drugs in Paradise," researchers found that 28—of which were Caribbean reef sharks, nurse sharks and lemon sharks—had "detectable levels" of cocaine, caffeine, acetaminophen (the active ingredient in Tylenol), as well as the painkiller diclofenac in their bloodstream.
Researchers noted that, to the best of their knowledge, this is the first report of caffeine and acetaminophen in "any shark species worldwide" and the first detection of diclofenac and cocaine in sharks in the Bahamas, which is "an environment commonly described as pristine."
The study argued that the changes were likely exacerbated by the country's rapid coastal development—with a growing number of tourists, rental properties and vacation homes—since tourism is a major economic driver.
Other changes were likely linked to "volume and chemical complexity of local wastewater," sharks' long lifespan and their "exposure to human-altered coastal habitats," according to the researchers.
The data also showed that fish with contaminated blood had changes in biological markers that can alter their behavior.
Although researchers aren't sure whether it will be detrimental to the animals, lead author Natascha Wosnick told CBS News that "chronic exposure" to these compounds could lead to "negative effects," since many have "no natural analog in marine systems."
Reinhard Dirscherl/ullstein bild via Getty Images
And although cocaine is an eyebrow-raising component, she emphasized that everything found in the sharks is a concern.
"While the detection of cocaine—an illicit substance—tends to draw immediate attention," the zoologist explained, "the widespread presence of caffeine and pharmaceuticals in the blood of many analyzed sharks is equally alarming."
However, she and her team aren't focusing on any potential dangers for humans, with Wosnick adding, "Our primary concern is not an increase in aggression toward humans, but rather the potential implications for the health and stability of shark populations."
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