We hear from time to time about how Mexican drug cartels are using drones and submarines to carry their product across the border, or co-opting local cell towers for their own communication needs. But the rest of the supply chain, and especially the last mile, seems so low-tech. It's just a mishmash of people connected by random chat apps.

Maybe, one day, one of the drug lords who is fed up with these inefficiencies will invest a few million dollars to develop an "Uber for drug dealers" (only to get hacked by the DEA on day 1).