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When humans ingest opioids like oxycodone, they ultimately end up excreting traces of the drugs into the toilet. Those chemicals then end up in wastewater. And while many contaminants are filtered out of wastewater before it's released into the oceans, wastewater management systems can't entirely filter out drugs. Thus, opioids, antidepressants, the common chemotherapy drug Melphalan -- the mussels tested positive for all of them.

Source: https://www.cbsnews.com/news/mussels-test-positive-for-opioi...

Oxycodone and its metabolites are excreted primarily via the kidney. The amounts measured in the urine have been reported as follows: free oxycodone up to 19%; conjugated oxycodone up to 50%; free oxymorphone 0%; conjugated oxymorphone ≤ 14%; both free and conjugated noroxycodone have been found in the urine but not quantified.[1]

[1]https://www.accessdata.fda.gov/drugsatfda_docs/label/2008/02...

You can’t metabolize all of your medicine all of the time.