Before revision: Legislation Because tritium is used in boosted fission weapons and thermonuclear weapons (though in quantities several thousand times larger than that in a keychain) , consumer and safety devices containing tritium for use in the United States are subject to certain possession, resale, disposal, and use restrictions .
After revision: Legislation Products containing tritium are controlled by law because tritium is used in boosted fission weapons and thermonuclear weapons (though in quantities several thousand times larger than that in a keychain) .