Evidence leading to conviction? Google remembers: http://www.cbc.ca/canada/calgary/story/2007/11/01/vuong-guilty.html which resulted in five people being charged under the Elections Act.
(Also some suggestions of impropriety in a NHL All-Stars election, and the scandal of a UBC Jr. Prom Queen election in 1935.)
Canadian elections use a paper ballot that is marked by the voter, folded to keep the choice private, then placed in a ballot box. When the poll closes, these votes are counted by a committee of electoral volunteers. If a ballot is not clearly marked, it is not counted. This process takes from less than one to several hours depending on how active the poll was and how efficient the poll workers are at opening and counting the ballots. Still, the election results are available before the morning papers print their front pages.
The argument against this system in the USA is one of scale, it would take days to tabulate.
I think an appropriate solution to the problem with certification would be to move the process away from the hands of companies like SysTest ( http://www.systest.com/news/97-systest-labs-redefines-voting-systems-testing-protocols-for-the-21st-century ) and into Universities, funded federally.