calibration curve | The Truth About Forensic Science

Zero is not a valid data point for calibration purposes

On March 6, 2012, in Chemistry, Equipment, Ethics, Ethics: Scientist, Identification, In The Courtroom, Laboratory Procedure, Metrology, by Justin J. McShane

When the quantitative measurement really matters to determine guilt, we have to understand how that measurement is achieved. In the case of the analysis of biological samples that are tested, quantitation of an unknown is derived from a calibration curve. The proper construction of the calibration curve is a crucial component of quality control. It […]

Quality Control in GC-FID: Teaching the machine right from wrong

On February 7, 2012, in Chemistry, Equipment, Ethics, Ethics: Scientist, GC-FID & GC/MS, Identification, In The Courtroom, Laboratory Procedure, Metrology, Standards, by Justin J. McShane

It is shocking but very true statement that most sophisticated instruments such as a Gas Chromatograph (GC) with various detectors whether it is a mass spectrometer (MS) or flame ionization detector (FID) when produced and manufactured are incapable of producing meaningful results “straight out of the box.” These machines have to be “taught” what it […]

Josh D. Lee is a Vinita, Oklahoma based criminal defense attorney. He is nationally recognized as a lawyer-scientist for his expertise on forensic science related topics. He has lectured well over 100 times in 18 diﬀerent states.

Mr. Lee has been invited to lecture at the American Chemical Society (ACS) as well as the American Academy of Forensic Science (AAFS). In 2011, Josh was elected Forensic Science Co-Chairman for the Chemistry and the Law Division of the ACS. He is also an “Assistant Chromatography Instructor” for the ACS.

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