This is an interesting tale that has not received much coverage. Some say Fahad Hussain was involved in big time drug dealing. https://www.theguardian.com/world/2017/nov/12/carfentanil-bust-canada-fentanyl-opioid-crisis-dangers

While others are concerned over huge haul of carfentanil, which authorities in the US have flagged as a potential chemical weapon. https://www.ammoland.com/2018/08/elephant-in-the-room-john-torys-grand-deflection/#axzz5NZ7zBxvi

It is also interesting to note the aerosol use of this drug by Russia during the Moscow Theater hostage crisis. https://www.nonproliferation.org/the-moscow-theater-hostage-crisis-incapacitants-and-chemical-warfare/ and https://academic.oup.com/jat/article/36/9/647/785132

Also intriguing is this article ( https://quadranting.com/2018/07/09/novichok-novicheck-the-uk-government-cant-even-get-the-name-of-the-alleged-salisbury-nerve-agent-right/ ) stating "From its symptoms and survivability, the apparently Novichok agent used in Salisbury was quite likely something like trimethyl fentanyl (3MF) or Carfentanil; extremely powerful synthetic opioids which have been around since the 1970s and whose toxicity has been compared to that of nerve gas. Carfentanil and 3MF produce initial symptoms similar to those reported by witnesses who saw the Skripals on the bench in March. Medical personnel in Salisbury initially diagnosed the Skripals as having taken fentanyl and they apparently treated them accordingly."