In Weir v. R., supra, an accused was convicted of refusing to comply with a roadside demand. The accused blew four times for approximately two seconds. The police officer then provided a demonstration for the accused. The police officer had explained that it usually takes seven or eight seconds to get a proper sample. In his evidence the police officer had used the term "roadside screening device" but nowhere did he refer to the A.L.E.R.T. as a Model J3A.
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