In opioid crisis, a new risk for police: accidental overdose

Carfentanil, a deadly and potent opioid
In this June 27, 2016 photo provided by the Royal Canadian Mounted Police, a member of the RCMP opens a printer ink bottle containing the opioid carfentanil imported from China, in Vancouver. Drug dealers have been cutting carfentanil and its weaker cousin, fentanyl, into heroin and other illicit drugs to boost profit margins.
Royal Canadian Mounted Police via AP