Defence lawyers need to convince the criminal justice system that "traceability" of all forensic measurements is a condition precedent to reliability. What does "traceability" mean and is it part of Canadian criminal law? What does the Canadian scientific community have to say about "traceability"? Why is the establishment of "calibration intervals" required to maintain "traceabilty"? Are "étalon" and "norme" the same thing? Are these concepts easier to understand in French?
Purposes: To connect evidentiary breath testing in Canada, the Criminal Code, and the Weights and Measures Act section 4(1) to the Metre Convention and the organizations created by the Metre Convention specifically the CGPM and the BIPM. To establish the primacy of the CGPM/BIPM and its SI units and vocabulary in any consideration of measurement science in Canada and internationally. To establish that Canada is a member state of the Metre Convention. To lay the groundwork for
Purpose: To obtain an admission from the CFS scientist that the traceability of a measurement result on an approved instrument or a truck weigh scale is through the calibration of the instrument at the factory or a proper recent re-calibration by the manufacturer or factory authorized service centre. At the time of calibration a calibration curve is created to establish a relationship between the electrical signal coming off the detector in the AI or the weigh scale and the d
Purpose: To separate the concepts of "calibration" from "control checks" To clarify that "calibration" is something that happens at the factory, not at time of use by a qualified technician To clarify that control tests at time of testing are simply a verification (to use the CFS scientist's words) that calibration hasn't changed over time (note Hodgson concept of "over time" in his paper referred to in St-Onge) Sample Cross-examination on clarification by CFS expert as to wh
Purpose: To educate the Court about the meaning of "traceability" in measurement science. To obtain an admission that there is a relationship between the calibration certificate (Certificate of Calibration) from the factory and the reference standards used during the factory calibration. To obtain an admission that there is a relationship between the calibration certificate from the factory and the scientific reliability of the measurement result at time of use. To introduce