A drop of elephant tranquilizer could kill you, and the Morgan County Coroner said heroin users are now mixing it with their drugs. Annette Davis Rohlman said heroin dealers in are mixing the drug with carfentanil. Carfentanil is a synthetic version of fentanyl, which has been another dangerous addition to some forms of heroin. It’s 10,000 times stronger than morphine. She said the numbers are up, and she expects more deaths than last year. She said the first responders carry Narcan, but it’s not working. One person was killed in 12 total overdoses in Jennings County a few weeks ago.