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WARNING: Please do not attempt to use any text, image, or video that you see on this site in Court. These comments, images, and videos are NOT EVIDENCE. The Courts will need to hear evidence from a properly qualified expert. The author is not a scientist. The author is not an expert. These pages exist to promote discussion among defence lawyers.

Intoxilyzer®  is a registered trademark of CMI, Inc. The Intoxilyzer® 5000C is an "approved instrument" in Canada.

Breathalyzer® is a registered trademark of Draeger Safety, Inc., Breathalyzer Division. The owner of the trademark is Robert F. Borkenstein and Draeger Safety, Inc. has leased the exclusive rights of use from him. The Breathalyzer® 900 and Breathalyzer® 900A were "approved instruments" in Canada.

Alcotest® is a registered trademark of Draeger Safety, Inc. The Alcotest® 7410 GLC and 6810 are each an "approved screening device" in Canada.

Datamaster®  is a registered trademark of National Patent Analytical Systems, Inc.  The BAC Datamaster® C  is an "approved instrument" in Canada.

March 29, 2018


To obtain an admission from the CFS scientist that the disclosed annual maintenance records indicate that the police failed to take any steps to correct control tests on inspection that indicated the instrument's response had shifted well beyond not only a 3 mg...

March 28, 2018


To demonstrate that when the particular instrument was first placed into service, the tolerance verified by the independent authorized service centre for each of three test values was +/- 3 mmg/100mls.

To demonstrate that the initial verification matched the man...

March 26, 2018


To establish that "traceability" is a scientific concept used in Canada.

To define "traceabilty" in a Canadian context.

To establish that "calibration interval" is a scientific concept used in Canada.

To explain the two English meanings of "standard" by reference...

March 25, 2018


To introduce the concept of "calibration interval" in the international literature.

March 25, 2018


To explore the differences between a measurement instrument that has a linear relationship between the thing measured and the result v. a measuring instrument that has a calibration curve.

To search for an admission that the calibration curve can shift up or dow...

March 24, 2018


To explain the function of internal standards, the ITP, internal test procedure to the Court.

To obtain an admission that the ITP system needs annual or periodic maintenance, just like the optical bench, so that the instrument can continue to function in accorda...

March 23, 2018


To establish that the hypothesis by the ATC/CFS, that any drift in instrument response (what Hodgson describes as significant drift in accuracy and precision over time) will always be caught by a single point control test, is not supported by any empirical stud...

March 2, 2018


To lay the groundwork for the argument that traceability of the measurement results to the SI units is through the calibration of the individual instrument to reference standards - the étalons.

If reliability, requires traceability, then the Certificate of Calib...

March 1, 2018


To educate the Court about the calibration sequence run on the approved instrument at the factory.

To obtain an admission from the Crown expert that without the proper auto-calibration creation of a unique calibration curve, the instrument is not reliable.

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