#Forensic #Science: “Locard’s Exchange Principle” takes a hit from a New Jersey DA overwhelmed by #DNA #Exoneration

In OJ, the jury explained his blood being found on scene “in the mixture” as, “Well, that could have gotten there anytime.”…

FORENSICS and LAW in FOCUS @ CSIDDS | News and Trends

The scientific sleuths form the past and present must be rolling over in their condominiums. See Richardson. The transfer of physical or biological material between two separate sources (in biology think spitting on your hands before swinging at a baseball pitch) is a pivotal area of crime scene investigation. Crime Scene 101 curriculua always makes this the “holy grail” of CSI paradigms. In reality and fiction (as seen on ABC)  forensic investigation,  Locard’s principle holds that the perpetrator of a crime will bring something into the crime scene and leave with something from it, and that both can be used as forensic evidence.

This snippet of knowledge is not the entire story. There are various scenarios of transfer “science.”

1) Mutual transfer: Two contacting surfaces, objects, or substrates (anything that can collect or retain the material) leave particulates (i.e., paint chips, skin cells, saliva from mutual kissing). This is…

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