DUI Metrology Dictionary

Drift

"Over time" an electronic signal can, and probably will, drift due to dust, dirt, and deterioration of electronic components. Intoxilyzers inevitably get exposed to all sorts of foreign objects and phenomena including cleaning fluids, vomit, spit, and interferents. Unfortunately there is very little or no research on this phenomenon in police-controlled settings. New Intoxilyzers cannot be bought. The CFS and other state labs are not sampling old instruments in the field and writing scientific papers about their findings. Governments resist FOI applications respecting the deterioration of their instruments over time. VIM 4.21(5.16) defines instrumental drift as "continuous or incremental change over time in ndication, due to changes in metrological properties of a measuring instrument. NOTE Instrumental drift is related neither to a change in a quantity being measured nor to a change of any recognized influence quantity."

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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.