Carfentanyl is probably responsible for a significant fraction of the overdose attributed to fentanyl : https://www.dea.gov/press-releases/2018/05/11/first-dea

Carfentanyl is probably responsible for a significant fraction of the overdose attributed to fentanyl : https://www.dea.gov/press-releases/2018/05/11/first-dea-seizure-carfentanil-new-york-acts-public-service-announcement https://www.dea.gov/press-releases/2018/05/11/first-dea-seiz... https://www.cbc.ca/news/canada/toronto/carfentanil-warnings-1.5199818 https://www.cbc.ca/news/canada/toronto/carfentanil-warnings-... https://www.wndu.com/content/news/Gray-Death-drug-mixture-reaches-Indiana-puts-first-responders-at-risk-422004694.html https://www.wndu.com/content/news/Gray-Death-drug-mixture-re... Not that fentanyl is safe but some addicts, like Denise in the article, used to be able to use it without dying, the same is almost impossible to do with carfentanyl.