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A protester lights a joint during a 4-20 marijuana rally on Parliament Hill in Ottawa on Friday, April 20, 2012. (Sean Kilpatrick/CP)
A protester lights a joint during a 4-20 marijuana rally on Parliament Hill in Ottawa on Friday, April 20, 2012. (Sean Kilpatrick/CP) The Canadian Press

What testing for cannabis looks like

As Canada prepares to legalize marijuana, it is totally unprepared to deal with the most dangerous side effect
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