Marine scientists analyzed blood samples from 85 sharks of five different species. The sharks were captured about six kilometers off the coast of one of the more remote islands of the Bahamas, and 24 substances, both legal and illegal, were found in their blood.
The sharks had detectable levels of caffeine and over-the-counter anti-inflammatory drugs, and one had cocaine in its blood. Some of the sharks tested positive for more than one substance, CBS News reports.
Pharmaceuticals and drug substances are a growing concern in oceans and other waters, as they can potentially affect the health and behavior of animals. Urban and tourist-dense areas are particularly vulnerable, according to researchers.
