QR Code Medical Delivery Drone: "Using the Matternet system, a technician would package the blood sample in a standardized box bearing a QR code. They would then scan the QR code on the station and deposit the box. The station would then affix the box to the drone, and send it to the appropriate test facility's station, guided with a signal to enable precision landing."
Source: http://mashable.com/2017/09/20/matternet-drone-delivery-switzerland/#3fCxc08WN5qL