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Is carfentanil the same way or can it be absorbed through skin?
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Same. Any powdered material needs a delivery system to cross the effective barrier of your skin.
You provide a delivery mechanism though and the analogs like sufentanyl or carfentanyl could be very dangerous.
It's just not a great choice for a mass casualty type weapon, up close and personal, maybe. Kill a football stadium full of people, probably not.