https://arstechnica.com/tech-policy/2019/12/faa-drone-industry-must-wait-three-plus-years-for-new-id-system/

The Federal Aviation Administration is implementing a new system that will allow comprehensive nationwide tracking of unmanned aerial vehicles (UAVs)—commonly known as drones. The new system will enable regulators, law enforcement, and other interested parties to track drone movements and in some cases obtain identifying information. All new drones will be required to comply with the proposed rules within three years after the regulations go into effect—but that's still months away.

The lack of a comprehensive system for drone identification and tracking has been a long-standing barrier to the adoption of commercial drone technology. Companies like Amazon and UPS, for example, have long dreamed of making package deliveries using unmanned vehicles. But such efforts were blocked by law enforcement agencies worried about unidentified drones being used for terrorism, drug smuggling, or other crimes.