Lee Carter
BBC News, Toronto
The use of Taser guns by the police is under fierce debate in Canada.
It follows the case of a Polish immigrant who died after officers from the Royal Canadian Mounted Police who twice stunned him with Taser guns and secured him to the floor.
After remaining in a secure part of Vancouver airport for nearly nine hours, Robert Dziekanski, who spoke no English, began shouting and throwing furniture before the police officers were called.
The final moments of Mr Dziekanski's life were captured on video by another traveller and released to the media, causing public outrage.
See how a Taser works
Investigations have started in Canada into the way the police handled the incident and their seemingly contradictory version of events.
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more:
http://news.bbc.co.uk/2/hi/americas/7116917.stm