I don't think this technology will be very useful for illicit purposes until there are enough drones in the sky to get lost in the crowd. They're not particularily inconspicuous when they're buzzing around.
Drones have been used for drug deliveries since 2009, at least. It's an obvious technology to get small things across borders. The unmanned submarines are how it scales to larger shipments.
Source: "And just last year, criminals piloted a $600 remote-controlled quadcopter over a Brazilian prison fence to deliver cell phones to the incarcerated, as was also done in a 2009 attempt involving a drone to deliver drugs to prisoners in the U.K."
