A 2023 study detected small traces of substances like cocaine, caffeine, and some pharmaceuticals in shark tissue. The study which involved taking samples of blood from 85 sharks near Eleuthera Island, the Bahamas is polluted with a disconcerting cocktail of pharmaceuticals.
The results revealed that most of the animals showed traces of caffeine and over-the-counter painkillers such as ibuprofen, while some even had traces of illegal drugs such as cocaine.
Where it comes from the contamination is believed to come from:
Wastewater runoff (human urine, improperly treated sewage)
Discarded or dumped drugs
Pharmaceutical residues entering the ocean
This kind of pollution has been found in many marine animals, not just sharks. The amounts detected were extremely low measured in parts per billion or trillion.
According to scientist, there’s no solid evidence that these levels:
Affect shark behavior
Make them more aggressive
Turn them into anything like the viral “cocaine sharks” idea
The study highlights how our own activities might come back to haunt us later down the line.