DUI Metrology Dictionary
Independent service provider (in the context of the Intoxilyzer)
Notice in R. v. Vallentgoed and R. v. Gubbins facts that the instrument(s) were sent to an outside entity for re-calibration. The outside facility should have ISO 17025 accreditation as a testing and calibration laboratory. If police are repairing and re-testing their own machines then notwithstanding the training in Kentucky that the senior officer has received, they are not ISO 17025 accredited. You might want to speak to a metrologist about this issue.