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Powdered Fentanyl can be breathed in or go through your skin… Easy to OD on. Hazmat does deal with this - in full suits. (Same for Carfentanil which is absolutely more potent.)
Years ago I read that using heroin allows for hypnosis and demonic possession to occur easier…wish I could remember what book…. If I remember right…said the same about any mind-altering substances.
On a side note…If you believe in God - "The Black Awakening" is an interesting read