So, as the last stop over letal poison, and because what it matters to me, is the potencial deadly cause by dermal contact only...or else, i would have dozens of substances...today...not Fentanyl but Carfentanyl ....this is 100.000 times more powerfull than morphine. for that obviouse reason, only skin contact with few micrograms of this opioid causes immdeiatly dead.