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  • Stephen Biss

Certificate of Calibration


Tip 14: Whenever police purchase a new NIST mercury thermometer, the Canadian distributor provides them with a "Guth Laboratories, Inc. Certificate of Calibration". The Certificate of Calibration indicates the serial number of the new thermometer, described therein as a "NIST REFERENCE THERMOMETER (SIMULATOR)" and the serial number of the "NIST LAB STANDARD (MASTER)" thermometer which in turn is indicated as traceable. The serial number of the new NIST mercury thermometer is clearly indicated on the back of the thermometer.

A good starting point for defence disclosure requests, in every over 80, is identification of the three or more instruments used to test the client: the serial number of the approved instrument, the serial number of the simulator, and the serial number of ANY thermometer (s) used (digital, RS232, or mercury) by the QT who conducted the subject tests. Defence should also ask for and get the serial number of ANY thermometer(s) used (digital, RS232, or mercury) by the QT who changed the solution. Such data is directly associated with the subject tests for the accused and should be part of the investigative file, even assuming the ATC Position Paper. If it is not provided by police to the Crown, McNeil should make it so.

Quaere: Notice the temperature recorded on the Certificate, by Guth, of "34.03" re the "NIST REFERENCE THERMOMETER (SIMULATOR)" 2992. How can a thermometer with 1/10 degree C gradations be read to 1/100 degree C?

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