Police reported the teenager to the prosecutors, accusing him of breaking the law concerning prevention from radiation hazards by possessing and selling key holders measured as containing more than 12 times the regulated level of tritium. Tritium illumination is the use of gaseous tritium, a radioactive isotope of hydrogen, to create visible light.
The Chiba Family Court threw out the case after it was revealed that the key holders were not harmful even if touched, and because the teen had sold so few.
The specific case for which the Chiba Prefectural Police sought to have the teen prosecuted involved his sale over a Net auction site of a key holder for 3,600 yen ($46) to a man in his 40s earlier in September.
The teen’s name has not been disclosed as he is a minor.