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    What testing for cannabis looks like

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

    Maclean's
    <p>A protester lights a joint during a 4-20 marijuana rally on Parliament Hill in Ottawa on Friday, April 20, 2012. (Sean Kilpatrick/CP)</p>

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

    tags:Editor's Picksmarijuanapot legalization