http://www.newsweek.com/shellfish-coast-seattle-test-positive-opioids-944239

An opioid has been discovered in shellfish off the coast of Washington state for the first time, according to a new study that suggests the effects of the pain killer epidemic have transcended the human population.  

Oxycodone was detected in mussels from the Seattle and Bremerton harbor areas of the Puget Sound in a Washington Department of Fish and Wildlife pollution survey. Traces of the chemotherapy drug melphalan, a potential carcinogen, were also discovered.