A breathalyzer (a portmanteau of breath and analyzer)'s a device for estimating blood alcohol content (BAC) from a breath sample. "Breathalyzer"'s the brand name of a series of models made by one manufacturer of these instruments (originally Smith and Wesson, later it was sold to National Draeger), but has become a genericized trademark for all such instruments. In Canada, a preliminary non-evidentiary screening device can be approved by Parliament as an approved screening device and an evident… (More on Breathalyzer)