There are, however, other relevant factors that should also be considered. When looking at the totality of the circumstances known to the officer, those factors that are inconsistent with impairment cannot be disregarded but must also be taken into account. In assessing reasonable and probable grounds all information known by the police officer must be considered; an officer is only entitled to disregard that which he has good reason to believe is unreliable: Chartier v. A.G. Quebec (1979), 1979 CanLII 17 (SCC), 48 C.C.C. (2d) 34 (S.C.C.).
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