The BAC DataMaster: Margin of Error and Interfering Substances
HOW THE MACHINE WORKS[1]The BAC DataMaster is an evidential breath testing machine which works on the principles of infrared spectrophotometry. Many vapors, including ethanol in the breath, absorb[2] infrared energy. The machine captures a breath sample in its testing chamber and sends a beam of infrared energy through the sample.[3] When infrared energy passes through the ethanol molecule[4], the molecule begins to vibrate at its Hydro-Carbon bond and in the process uses up some, or all, of the energy.[5] Repeated scientific experimentation has allowed chemists to conclude that ethanol vibrates at – to varying degrees – are 3.4, 5 and...
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