>> Police Officers should also be held to a higher standard when they kill unarmed citizens.
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And on what Canadian case do you base your (US imported) rhetoric? 
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>> Try to imagine the reverse: a citizen being declared not-guilty just by declaring he feared for his life in an encounter with the police.
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Police don't  draw weapons out at just an "encounter".  Not to mention - this "imaginary upstanding" citizen would be walking around armed why, in the first place?