Welcome to the real world of forensics, where the wizardry lionized by the “CSI” television empire turns out to have serious flaws. The science of bite-mark comparisons, ballistic comparisons, fingerprint matching, blood-spatter analysis, arson investigation and other common forensic techniques has been tainted by systematic error, cognitive bias (sometimes called “tunnel vision”) and little or no research or data to support it. There is, in short, very little science behind some of the forensic “sciences” used in court to imprison and sometimes execute people.
Source: latimes.com – Los Angeles Times