Blog | quantitativeanalysis

Sep 28, 2018
4 min

Purpose of disclosure or production of maintenance records and data

What is the purpose in Stinchcombe/McNeil disclosure or O'Connor production of maintenance records and historical data? Government scientists are right in saying that there is no causal relationship between the historical data and the results of a subsequent subject test. Factors like dirt in the sample chamber or degradation in the electronic signal coming out of the detector at the end of the sample chamber, over time, may cause error. Inadequate factory calibration may c

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Stephen Biss

May 16, 2018
1 min

Annual Inspections Done Without Reference to Manufacturer's Specifications

Purpose: To confirm that when new instruments are being evaluated, various solutions are used between 50 and 400 mg/100mls. To confirm that when new instruments are being evaluated, the specified accuracy requirement is +/- 5 percent of the BAC with a precision requirement of +/- 3 mg/100mls under 100 mg/100mls and +/- 2.5 percent for readings greater than 100. To confirm that the purpose of such evaluation is to ensure the accuracy and reliability of breath tests. This proc

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Stephen Biss

Apr 20, 2018
1 min

Relevance of Contemporaneous Documentation by Inspector Taking Instrument Out of Service

Purpose: To establish that if there is an indication in the maintenance records that the instrument was taken out of service for consistently low checks, it is necessary to obtain disclosure or production of the contemporaneous documentation by the inspector, who made that decision, and the printouts obtained by the inspector from the Intoxilyer to understand the context and significance of that decision to take the instrument out of service. #annualmaintenance #inspection #c

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Stephen Biss

Apr 5, 2018
1 min

ABA Sequences v ACA Sequences

Purpose: To explain to the Court, the differences between ABA (Esc Esc B) and ACA (Esc Esc C) sequences To confirm that ABA sequences are not recorded in COBRA data but ACA sequences are recorded in COBRA data. To explain to the Court why the calibration checks at 40 or 50, 100, and 300 during annual inspections do not appear in COBRA data disclosed. #COBRA #annualmaintenance #inspection #controltest

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Stephen Biss

Apr 4, 2018
1 min

3 Consecutive Annual Inspections Reveal a Trend Towards Unreliability

Purpose: To obtain an admission from the government scientist that a review of the documents from 3 annual inspections reveals a trend such that indications in the lower portion of the measuring interval are reading low and indications in the upper portion of the measuring interval are reading high, in other words, the response of the instrument to known levels of alcohol standard has drifted such that there has been a trend in change in the accuracy of the instrument. To co

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Stephen Biss

Mar 29, 2018
1 min

Police Fail to Correct a Linearity Problem on In-House Annual Inspection

Purpose: To obtain an admission from the CFS scientist that the disclosed annual maintenance records indicate that the police failed to take any steps to correct control tests on inspection that indicated the instrument's response had shifted well beyond not only a 3 mg% tolerance, but well beyond a 10mg% tolerance. To suggest to the CFS scientist that the calibration curve has shifted. To suggest to the CFS scientist that the instrument's response is no longer as accurate an

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Stephen Biss

Mar 28, 2018
1 min

Police No Longer Follow ATC Best Practices Respecting Tolerance

Purpose: To demonstrate that when the particular instrument was first placed into service, the tolerance verified by the independent authorized service centre for each of three test values was +/- 3 mmg/100mls. To demonstrate that the initial verification matched the manufacturer's published specifications. To demonstrate that when the particular instrument is subsequently being annually checked at each of the three test values, the checklist indicates that the acceptable tol

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Stephen Biss

Mar 24, 2018
1 min

Internal Standards Also Need Calibration and Calibration Interval

Purpose: To explain the function of internal standards, the ITP, internal test procedure to the Court. To obtain an admission that the ITP system needs annual or periodic maintenance, just like the optical bench, so that the instrument can continue to function in accordance with manufacturer's specifications. To obtain an admission that any adjustment or re-calibration of the optical bench also requires re-calibration of the internal standards. #calibration #calibrationinterv

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Stephen Biss

Feb 25, 2018
1 min

AI Hardware and Software Can't Measure Without Learning and Re-Learning

Purpose: To educate the Court as to the "why" of the unreliability of an approved instrument to measure across the measuring interval if it has not been recently calibrated, inspected, maintained, re-calibrated. It seems strange to think that a modern "approved instrument" has to "learn" - that it has a kind of artificial intelligence. In reality it's true, an approved instrument has to learn the meanings of 67 mg/100mls, 94 mg/100mls, 117 mg/100mls, and 184 mg/100mls. The ar

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Stephen Biss

Feb 10, 2018
1 min

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 scientists are right in saying that there is no causal relationship between the historical data and the results of a subsequent subject test. Crown CFS scientists are incorrect in saying that maintenance records and historical data are irrelevant in assessing the scientific reliability of a measurement result. Control tests, cal. checks, and simula

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Stephen Biss

Feb 2, 2018
1 min

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 independent inspection v. an in-house annual or in-house periodic inspection by the local police service. To establish that these inspections are inadequate unless accompanied by complete documentation - that needs to be produced on the O'Connor application. #inspection #SOPs #annualmaintenance #independent

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Stephen Biss

Jan 28, 2018
1 min

Precision Testing Using Only 2 Data Points is Inadequate to Calculate Precision

Purpose: To educate the Court as to the inadequacy of calculation of the instrument's precision by the local police service, close in time to the subject tests. To obtain admissions from the CFS expert as to proper methods for calculating precision. To confirm evidence that the local police had stopped doing linearity checks by the time of this periodic inspection. #annualmaintenance #precision #inspection #stabilitytesting

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Stephen Biss

Jan 24, 2018
1 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. To explore the lack of Standard Operating Procedures when accuracy and precision of the instrument are checked on periodic or annual inspection. #analyticalvariability #inspection #annualmaintenance #precision #accuracy #SOPs

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Stephen Biss

Jan 15, 2018
1 min

No Supervision by ATC, CFS, or Anyone of Annual/Periodic Inspection SOPs

Purpose: To show that the ATC recommendations for operational procedures at time of use do not account for the need during inspections to regularly conduct control tests at target values other than 100 mg/100mls. To demonstrate that we have no metrological supervision to ensure that linearity is checked, that manufacturer's specifications are honoured across the measuring interval. To demonstrate that searches of breath using"approved instruments" are unreasonable in Canada i

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Stephen Biss

Jan 10, 2018
1 min

Beer-Lambert Law as Stated in Training Aid is Over-Simplified and Inadequate

Purpose: To obtain admissions that the concept of single point control test(s) at time of use is adequate, to verify calibration has not changed over time, is not good measurement science. To obtain admissions that checks of linearity during annual maintenance or other periodic inspection are necessary to confirm linearity, to confirm that the instrument is still calibrated across the whole measuring interval. To obtain an admission that although the Beer-Lambert Law suggests

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Purpose of disclosure or production of maintenance records and data

Annual Inspections Done Without Reference to Manufacturer's Specifications

Relevance of Contemporaneous Documentation by Inspector Taking Instrument Out of Service

ABA Sequences v ACA Sequences

3 Consecutive Annual Inspections Reveal a Trend Towards Unreliability

Police Fail to Correct a Linearity Problem on In-House Annual Inspection

Police No Longer Follow ATC Best Practices Respecting Tolerance

Establishment of Calibration Intervals

Internal Standards Also Need Calibration and Calibration Interval

AI Hardware and Software Can't Measure Without Learning and Re-Learning

Causation of Error v. Calculation of Drift in Precision - Evidence Based Assessment of Reliability

Independent Annual Inspections v In-house Inspection by Local Police

Precision Testing Using Only 2 Data Points is Inadequate to Calculate Precision

Checking Analytical Variability and Accuracy of the Instrument? Where?

No Supervision by ATC, CFS, or Anyone of Annual/Periodic Inspection SOPs

Beer-Lambert Law as Stated in Training Aid is Over-Simplified and Inadequate