Forensics expert and
Pennsylvania DUI attorney Justin J. McShane presents an ongoing forensic science reference for DUI lawyers and criminal defense attorneys.
Attorney McShane is the Chairman/CEO of The McShane Firm,
Pennsylvania's top DUI law office. Located in Harrisburg, PA, The McShane Firm specializes in using forensic science to defend citizens accused of a crime.
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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PennStateCSI says:
1. Blue “glow” appears to be chemiluminescence.
2. Blue chemiluminescence is produced when hemoglobin in blood catalyzes the decomposition of a peroxide to form free oxygen. The free oxygen reacts with luminol. At the end of the reaction cascade, the luminol has been transformed to an excited state molecule. The excited state molecule returns to the ground state accompanied by the emission of light.
3. Limitations include production of “false positives” (dependent upon application method) with several different materials including metals and oxidizers (cleaning agents, etc.) and dilution of small quantities of blood, which may affect subsequent DNA analysis.
Justin J. McShane says:
Great job! You will be our forensic science geek of the week winner!