• Stephen Biss

Reliability: Cal Checks in the Context of Earlier & Later Ambient Fails

Tip 47: A calibration check using a wet-bath #duisimulator containing alcohol standard is not reliable if information is missing about air blanks associated with the cal checks.

When you watch this video, you will see two video segments at 19:34 and 19:37 with stand-alone cal checks that do not produce ambient fail or purge fail exception messages, yet the calibration checks are strange. In both cases 045 alcohol standard produces a 000 result. Are these cal checks reliable? It would appear that zero has been set by the IR instrument above 45 mg/100mls and so the cal check results are each 000. This isn't supposed to happen if the IR instrument has a properly functioning ambient fail system.

The problem is that zero must have been compromised in an earlier sequence. Video segnents at 19:35 and 19:38 shed light on what happened, as would video segments before 19:34.

Disclosure of printouts from a single stand-alone cal check and the cal checks associated with a pair of subject tests, doesn't tell the whole story of whether or not the cal checks are reliable and whether or not ambient alcohol was absent from the room.

#ambientfail #reliability #tip

0 views0 comments

© 2020 Allbiss Lawdata Ltd. All rights reserved. This is not a government web site.



For more information respecting this database or to report misuse contact: Allbiss Lawdata Ltd., 303-470 Hensall Circle, Mississauga, Ontario, Canada, L5A 3V4, 905-273-3322. The author and the participants make no representation or warranty  whatsoever as to the authenticity and reliability of the information contained herein.  WARNING: All information contained herein is provided  for the purpose of discussion and peer review only and should not be construed as formal legal advice. The authors disclaim any and all liability resulting from reliance upon such information. You are strongly encouraged to seek professional legal advice before relying upon any of the information contained herein. Legal advice should be sought directly from a properly retained lawyer or attorney. 

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.
DrugTest® 5000 is also a registered trademark of Draeger Safety, Inc.. DrugTest® 5000 is "approved drug screening equipment" 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.