The proposal was introduced in the context of the 2012 Quebec student protests, and the riots following the 2011 Stanley Cup championship in Vancouver. However, in both circumstances a vast majority present were not wearing masks. On June 19, 2013, Bill C-309 became law, banning the wearing of masks during a riot or unlawful assembly, carrying a maximum 10-year prison sentence with a conviction of the offence. The Liberal and Conservative parties voted unanimously in favour of the legislation. The Bloc Quebecois, Green Party and NDP cast 96 votes against the bill.