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Control Tests do not displace Formal Calibration Intervals

January 13, 2018

Purpose:

To separate conceptually control tests from calibration

To obtain an admission that there are no "assessors" in the province of Ontario

To obtain an admission that the historical maintenance records show a deterioration of performance - deterioration of linearity in this particular instrument

The strategy of using control tests as indication of reliability depends upon completeness of records and transparency

To obtain an admission that at the bottom of the valley in the infrared spectrum at approximately 9.4 microns, your detection limit will certainly be degraded and precision will also suffer in most instances, if you are no longer taking the reading at the absorbant’s maximum.

To obtain an admission as to what may happen if the detector becomes dirty.

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If you are a Canadian criminal defence lawyer and you wish to learn more about cross-examination on these issues, we suggest that you visit the Members page at www.impaired-driving.com and enroll in the three online courses that are described therein. Once you have completed the three online courses, you can apply to become a full Member at that site, and if you are accepted for membership, you will have access to the much more extensive Members Only Blog at that site, as well as  additional international resources, links, and materials.

If you are a Canadian criminal defence lawyer and you wish to learn more about cross-examination of Drug Recognition Experts we recommend that you attend an online or recorded session at  https://www.impaired-driving.com/dre-tutorial.

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