Quote:
Originally Posted by Iowa_Flames_Fan
To clarify this point: the roadside testing device is not the device that takes the "breath sample" that is admitted into evidence in court. It's merely a screening device, where a "fail" on the screening device prompts the officer to read you the breath demand. At that point, a different device (in Calgary it's usually an Intoxilyzer 400D) is used to collect a breath sample, and that's where you get your reading from.
The roadside devices are considerably less accurate, partly because they're really only designed to place you into a broad range of readings for the purposes of screening people who will be given a breath demand. This may partly account for the confusion--there are actually two separate devices in issue here)
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Roadsides can be used as evidence as previously discussed. Also, the intoxilyzer 400 D is the older roadside screening device:
The actual machine you "blow" into at an office would be Intoxilyzer 5000 Breathalyzer pictured below:
Both are admissible in court.