Isn't this fixed by:

A: unpacking and inspecting the packages? B: The company assuming the risk and liability. C: The company collecting evidence through KYC and cooperating in the case of crime?

Probably too much hassle to save some bucks when compared to a courier service, though.

A. Maybe. Are you going to ship with someone who is going to open your package and rifle through it, though? I would personally also not feel confident in my ability to check fully for hidden illicit material if I were the courier.

B. No. Absent laws indemnifying the courier, a company saying “I’ll take the heat for those drugs you’re carrying” is not a meaningful act.

C. No. This seems like more of B.

This is all surmountable if the laws allow it. I assume FedEx drivers don’t go to jail of a package unknowingly contains drugs. But I don’t know what needs to be in place for random Joe to be acting as a casual courier without taking on legal liability.