2015 Tokyo drone incident
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In the 2015 Tokyo drone incident (首相官邸無人機落下事件, sushōkandemujinkirakkajiken), a Phantom 2 drone carrying traces of radiation was found on the roof of the Japanese Prime Minister's Official Residence.[1] It had been controlled by Yasuo Yamamoto, an anti-nuclear protester from Fukui Prefecture.[2] Yamamoto flew the drone there carrying sand containing caesium from Fukushima prefecture on April 9, but the drone was not discovered until April 22.[3]
This caused substantial embarrassment to the authorities, both for the security breach and for the delayed discovery of the drone. Yamamoto was later given a two-year suspended sentence,[4] and the incident led to wide-reaching changes to regulations on drones in Japan. This along with other incidents led to authorities in Japan becoming much more aware of issues related to drones.