What Is Fentanyl?

Fentanyl started getting cut into heroin particularly on the east coast like pretty early on probably like 10 or more years ago now. Now there is really no like other opioid supply so things like heroin are almost impossible to come by just because it doesn't exist in the world. And then with the rainbow fentanyl angle the the DA's been talking about how name of fentanyl is this new thing to market to children they've sort of like market a lot being like this is some advertising job done by big drug to sell to sell to kids.