2015 Event Water pollution in Rio de Janeiro may pose health hazards to participants in the Summer 2016 Olympics; the World Health Organization has asked the International Olympic Committee to expand its list of tested substances to protect the athletes 2013 Event Britain agrees to help Syria destroy over 165 tons of chemical weapons; the stockpile includes substances that could be used to make highly toxic nerve agents 1976 Event Congress passes Toxic Substances Control Act 1920 Event Joint Rules Com bans foreign substances and alterations to baseballs
