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Maybe the Instrument Is No Longer Linear Enough to Be An "8000C"
Purpose: To explore the analytical variability of the 8000C as determined by the Alcohol Test Committee during evaluation of the 8000C...
Stephen Biss
May 22, 20185 min read


BAC Analysis in a Lab Without Bracketing Controls is at Best Qualitative not Quantitative
We have a serious problems in the Canadian criminal justice system. One of them is the failure of Parliament and the Courts to recognize...
Stephen Biss
Apr 27, 20184 min read


Change at One Point but Not at Another Point that is Equivalent
This is a sample excerpt from a cross-examination of a Crown expert using data from periodic inspection of an approved instrument. The...
Stephen Biss
Apr 13, 20185 min read


Police Fail to Correct a Linearity Problem on In-House Annual Inspection
Let's suppose that you obtain disclosure or Freedom of Information documents respecting In-house Periodic Inspections by your local...
Stephen Biss
Mar 29, 20186 min read


Why Does the ATC Say Single Point Control Tests are Good Enough?
Purpose: To explore the differences between a measurement instrument that has a linear relationship between the thing measured and the...
Stephen Biss
Mar 25, 20186 min read


Response Drifts Over Time
In an article relied upon by the SCC in St. Onge, Brian Hodgson stated: Defence lawyers need to educate themselves about the meanings of...
Stephen Biss
Mar 23, 20183 min read


What is measurement?
Purpose: Cross-examination of a CFS scientist on the VIM. To connect "measurement" in Canadian evidentiary breath testing to...
Stephen Biss
Feb 15, 20186 min read


Control Tests do not displace Formal Calibration Intervals
Purpose: To separate conceptually control tests from calibration To obtain an admission that there are no "assessors" in the province of...
Stephen Biss
Jan 13, 20187 min read


Linearity Studies are Done on New Instruments not Aging Instruments
Purpose: To obtain admissions that the published studies dealing with the linearity of approved instruments assume a new instrument...
Stephen Biss
Jan 12, 20182 min read


Instrumental Deviations from Beer-Lambert Law
This blog entry explores the use of a university textbook during cross-examination of a CFS scientist on "Instrumental Deviations from...
Stephen Biss
Jan 11, 201810 min read


Beer-Lambert Law as Stated in Training Aid is Over-Simplified and Inadequate
This blog entry contains excerpts from the cross-examination of a CFS scientist during an over 80 trial. It was suggested to the...
Stephen Biss
Jan 10, 201811 min read
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