But It Works on TV!

By Begley, Sharon | Newsweek, April 12, 2010 | Go to article overview

But It Works on TV!


Begley, Sharon, Newsweek


Byline: Sharon Begley

Forensic 'science' often isn't.

In a culture smitten by CSI, NCIS, and Bones, it wasn't surprising that the jury bought the blue-jeans testimony. Testifying in a 1989 murder trial in upstate New York, a forensic scientist explained that the imprint on a pickup owned by the accused could have been made only by the victim's jeans--of which a mere 200 had been sold in the area. The scientist described her meticulous analysis of fabric and stitching; soil from the truck also matched dirt at the crime scene. The jury bought it: guilty.

If this had been a TV show in which forensic science solves murders through bite marks, footprints, even sand grains (a match between the grit on a suspect's shoe and the beach where the victim was killed!), that would have been the end of it. In real life, the convicted man was innocent, as DNA analysis revealed (he was freed in 2008). It was no aberration. According to the Innocence Project, of the 252 DNA exonerations since 1989, half the convictions were based at least partly on "unvalidated or improper forensic science." The surprise is that the rate isn't higher: a 2009 report by the National Academy of Sciences found that, in contrast to DNA matching, "for many other forensic disciplines--such as fingerprint and toolmark analysis--no studies have been conducted" to determine how many shoes, teeth, fibers, sand grains, or anything else "share the same or similar features" and so might be linked to the wrong person. As a result, invalid forensic science "may have" helped convict innocent people.

There is no "may" about it. An Idaho man was convicted of rape and murder based on shoe prints; he spent 18 years on death row. A Louisiana man was convicted of rape when a bite-mark analyst testified that he "is the person who bit this lady." Both were exonerated by DNA.

The readership of NAS reports, unfortunately, is hardly enough to fill a voir dire, and little has changed. There is no progress toward creating a National Institute of Forensic Science, as the report recommended, and the only forensic field that is formally trying to be more scientific is fingerprinting, which is already better than analyses of bite marks, handwriting, lip prints, shoe prints, and other variants of "pattern recognition." Individual prosecutors may be declining to bring cases based on dubious forensics, says staff attorney Nina Morrison of the Innocence Project, and--in a first--a federal judge in Massachusetts ordered lawyers to actively challenge forensics that have long been presumed valid, including ballistics and fingerprints, and prosecutors to be prepared to have it scientifically validated. …

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