Sharks in the Bahamas are consuming substances including caffeine, painkillers and even cocaine, according to a new study by marine scientists who say it could potentially impact the animals' health and behavior.The research team, made up of marine biologists and scientists from a variety of international programs, analyzed blood samples from 85 sharks of five different species. The sharks were captured about four miles off the coast of a remote island and their blood levels were tested for 24 legal and illegal drugs. Twenty-eight of the sharks had detectable levels of caffeine, two common over-the-counter anti-inflammatory painkillers, or, in one instance, cocaine in their blood, according to the study. Some tested positive for more than one substance. Medications, illicit drugs and other substances are "increasingly recognized as contaminants of emerging concern" in oceans and other bodies of water, the researchers said.…