#drift

May 22, 20185 min read

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...

Apr 6, 20186 min read

Start By Defining "Reliability" don't focus on "Accuracy"

Purpose: To remind the Court, "thing 1" in 258(1)(c) is unconstitutional under Charter 11(d) (R v St-Onge) but is saved by section 1. To...

Apr 4, 20185 min read

3 Consecutive Annual Inspections Reveal a Trend Towards Unreliability

Let's suppose that you obtain, as the result of disclosure or a Freedom of Information application of paper or electronic documents,...

Mar 25, 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...

Mar 23, 20183 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...

Feb 1, 20181 min read

Periodic Inspection Must Be Done Under Stable Lab Conditions

Purpose: To challenge the CFS expert's position that inconvenient data should be excluded for the purpose of calculating precision. To...

Jan 14, 20187 min read

Error Rates and Drift in Precision

Purpose: To establish that the ATC/CFS is not sampling from aging instruments out in the field to determine error rates To establish that...

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