'Dose as small as a grain of sand can kill you': alarm after Canada carfentanil bust

It was a carbon monoxide alarm that brought the Canadian authorities to the house in Liatris Drive, a quiet residential street lined with manicured gardens. As firefighters checked over the house to ensure its inhabitants were safe, something else caught their eye: kilograms of a mysterious powder sitting in the basement.
Read more: https://www.theguardian.com/world/2017/nov/12/carfentanil-bust-canada-fentanyl-opioid-crisis-dangers?source=Snapzu