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Dayton DUI Attorney Charles Rowland > Posts tagged "Technology"

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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Forensic Science and Fingerprints

Image via CrunchBaseWith a new analytical technique, a fingerprint can now reveal much more than the identity of a person. It can now also identify what the person has been touching drugs, explosives or poisons, for example.Writing in Friday’s issue of the journal Science, R. Graham Cooks, a professor of chemistry at PurdueUniversity, and his colleagues describe how a laboratory technique known as mass spectrometry could find a wider application in crime investigations.The equipment to perform such tests is already commercially available, although expensive. Smaller, cheaper, portable versions are probably only a couple...

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