He was just a mule for one of the Mexican cartels and 3.5 pounds is no BFD. In the mid ‘80’s my personal lawyer and friend was hired to defend an indigent Colombian national who was arrested on I-95 in Maryland with fifty or so pounds of 95% pure coke. My friend got the accused to make a plea deal with the feds to serve twenty years without ratting out anyone above him. The Colombian cartel who hired my friend was extremely happy with the result and paid a healthy fee. My friend said he would never take a case like that again no matter how much he was going to be paid.
I think 0.01 of a gram or less is lethal. Not even close to the same as coke
Fentanyl is so concentrated and deadly that police have died from even touching it.