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Continuity of Alcohol Standard Solution: Keep from Freezing
Many years ago I asked for timely disclosure/production of a representative bottle of the alcohol standard lot used during the breath...
Stephen Biss
Dec 21, 20227 min read


Ancient Egypt and DUI Metrology
If you served wine or beer at a pub in ancient Egypt the beverages were measured out using liquid volume instruments like these. Each...
Stephen Biss
Nov 23, 20224 min read


Canada's NRC on Traceability
Defence lawyers need to convince the criminal justice system that "traceability" of all forensic measurements is a condition precedent to...
Stephen Biss
Mar 26, 20185 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


Traceability of Measurement Results is Through the Certificate of Calibration
"Traceability" is an important concept in metrology - measurement science. Defence lawyers need to study metrology, find experts, and...
Stephen Biss
Mar 2, 20186 min read


8000C Auto-Calibration Sequence - How to Run the Auto-Calibration Sequence
Purpose of this cross-examination: To educate the Court about the calibration sequence run on the approved instrument at the factory. To...
Stephen Biss
Mar 1, 20186 min read


Traceability of Measurement Result on an Approved Instrument
Purpose: To obtain an admission from the CFS scientist that the traceability of a measurement result on an approved instrument or a truck...
Stephen Biss
Feb 14, 20184 min read


The "known" is the original calibration of the instrument
Purpose: To separate the concepts of "calibration" from "control checks" To clarify that "calibration" is something that happens at the...
Stephen Biss
Jan 10, 20182 min read


Traceability of a Measurement Result
Purpose: To educate the Court about the meaning of "traceability" in measurement science. To obtain an admission that there is a...
Stephen Biss
Jan 9, 201812 min read
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