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Causation of Error v. Calculation of Drift in Precision - Evidence Based Assessment of Reliability
What is the purpose in Stinchcombe/McNeil disclosure or O'Connor production of maintenance records and historical data? Crown CFS...
Stephen Biss
Feb 10, 20187 min read


Heater Response Time on Guth 2100
Purpose: To further challenge the Crown's suggestion that the anomalous low cal. checks that occurred in this breath truck were not...
Stephen Biss
Feb 9, 20187 min read


Cross-examination about Henry's Law
Purpose: To use the cross-examination of the CFS scientist to educate the Court about Henry's Law Q. All right. In a nutshell, what’s...
Stephen Biss
Feb 8, 20182 min read


Use of Wet-bath Simulator in Winter Cold Temperatures
Purpose: To cross-examine a CFS scientist on use of Guth 2100 wet-bath simulator under Canadian cold operating conditions To build a case...
Stephen Biss
Feb 7, 20184 min read


Wet-bath Simulators Manufacturer Specs
Purpose: To obtain an admission from a CFS scientist that expectation of ATC Best Practices Recommendation is for annual inspection of...
Stephen Biss
Feb 6, 20184 min read


Uncertainty of Measurement is Not Novel Science
Purpose: To obtain an admission from a CFS scientist that uncertainty of measurement is not novel science. A. ...So, it’s a static...
Stephen Biss
Feb 5, 20183 min read


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...
Stephen Biss
Feb 4, 20185 min read


Independent Annual Inspections v In-house Inspection by Local Police
Purpose: To obtain admissions as to the differences in inspections, in inspection standard operating procedures, and completeness of an...
Stephen Biss
Feb 2, 20186 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...
Stephen Biss
Feb 1, 20181 min read


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...
Stephen Biss
Jan 31, 20185 min read


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...
Stephen Biss
Jan 30, 20185 min read


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...
Stephen Biss
Jan 29, 20186 min read


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,...
Stephen Biss
Jan 28, 20185 min read


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...
Stephen Biss
Jan 27, 20189 min read


Downloaded Data is a Key Source of Information to Find Out Reason for Re-calibration
The approved instrument referred to, in the case below, was sent out for a recalibration, a few days after the client's subject tests. We...
Stephen Biss
Jan 26, 20182 min read
Police don't follow their Standard Operating Procedures
Purpose: To establish non-compliance with the Standard Operating Procedure respecting entering accurate data into the tombstone data...
Stephen Biss
Jan 25, 20181 min read


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....
Stephen Biss
Jan 24, 20184 min read


Being Intolerant Depends on Humans not the Machine
Purpose: To challenge the Crown's assertion that the AI will automatically shut down if anything is out of tolerance or ATC or...
Stephen Biss
Jan 23, 20182 min read


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...
Stephen Biss
Jan 22, 20186 min read
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...
Stephen Biss
Jan 21, 20181 min read
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