Annual Inspections Done Without Reference to Manufacturer's Specifications
This is a sample cross-examination of an Ontario CFS scientist on the procedure used to perform an initial factory calibration (or a...
top of page
duimetrology.com
905-273-3322 or 1-877-273-3322
Search
Stephen Biss
- Apr 13, 2018
- 5 min
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...
3 views0 comments
Stephen Biss
- Apr 6, 2018
- 6 min
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...
9 views0 comments
Stephen Biss
- Mar 23, 2018
- 3 min
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...
11 views0 comments
Stephen Biss
- Feb 28, 2018
- 3 min
How to Calibrate - Teach an AI - Build the Inverse Logarithmic Calibration Curve
Purpose: To educate the Court about the Analytical Theory of the 8000C Optical Bench including Emitter, Sample Chamber, Dual Detectors,...
11 views0 comments
Stephen Biss
- Feb 4, 2018
- 5 min
Uncertainty of Measurement for Lawyers and Judges
Lawyers and Judges need to get past their deep-seated fear of uncertainty. If we are to promote the use of good science, in Court, we, as...
17 views0 comments
Stephen Biss
- Feb 1, 2018
- 1 min
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...
3 views0 comments
Stephen Biss
- Jan 31, 2018
- 5 min
Police Services Use Control Test Data Outside MPE to Calculate Precision
Purpose: To obtain an acknowledgement from a CFS scientist that even though he would exclude data outside (the Maximum Permissible Error...
4 views0 comments
Stephen Biss
- Jan 30, 2018
- 5 min
Ignoring Inconvenient Data in Calculation of Precision
Purposes of this cross-examination: To challenge the opinion that data outside maximum permissible error (outside +/- 10 mg%) should be...
2 views0 comments
Stephen Biss
- Jan 29, 2018
- 6 min
Defence Methodology Calculating Precision in the Field
Purpose: To establish a better methodology for calculating precision of an approved instrument in service. To apply CFS methodology using...
2 views0 comments
Stephen Biss
- Jan 28, 2018
- 5 min
Precision Testing Using Only 2 Data Points is Inadequate to Calculate Precision
Purpose: To elicit evidence to the Court as to the inadequacy of calculation of the instrument's precision by the local police service,...
2 views0 comments
Stephen Biss
- Jan 27, 2018
- 9 min
Government Scientists Calculate Uncertainty of Measurement - Why Can't We?
Purpose: To obtain admissions about the use of historical control test data by the Centre of Forensic Sciences in Toronto to calculate...
11 views0 comments
Stephen Biss
- Jan 24, 2018
- 4 min
Checking Analytical Variability and Accuracy of the Instrument? Where?
Purpose: To explore the lack of a lab setting when accuracy and precision of the instrument are checked on periodic or annual inspection....
7 views0 comments
Stephen Biss
- Jan 22, 2018
- 6 min
Distorted Concept of "Accuracy", "Precision", and "Reliability"
Purpose: To remind the Court of the concept of "reliability" used by the SCC in St-Onge. To educate the Court as to the definitions of...
5 views0 comments
Stephen Biss
- Jan 21, 2018
- 1 min
Attempt to Distinguish from Jackson and Vallentgoed
Purpose: To support argument that the Maintenance History shows that the instrument was taken "out of service", for "consistently low...
4 views0 comments
Stephen Biss
- Jan 19, 2018
- 5 min
No Sampling of Aging Instruments in the Field
Purpose: To suggest that ATC/CFS scientists cannot provide any scientific opinion of the reliability of aging instruments out in the...
1 view0 comments
Stephen Biss
- Jan 15, 2018
- 6 min
Manipulating Control Test Data to Enhance Precision
Purpose: To neutralize the government scientist's assertion that anomalous data should be excluded from calculation of precision. To...
3 views0 comments
Stephen Biss
- Jan 14, 2018
- 7 min
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...
5 views0 comments
bottom of page