What Do Fingerprints Prove?
By now, you may be aware of my healthy skepticism when it comes to "scientific" evidence. Even top physicists these days claim that matter may not actually exist until we consciously observe it (cool stuff, but a Schrödinger's Cat discussion is a topic for another day). So, when a lab analyst tells a jury that a defendant's fingerprints "match" the prints found at a crime scene, we know that the analyst isn't really saying that these fingerprints are from the same person--but rather--that the two sets of prints have a few unique characteristics that match. Retina scans, by comparison, can be far more accurate because our retinas have over 200 unique identifying characteristics (not so many unique characteristics to match up with fingerprints).
When defending a case involving fingerprints, what happens when the criminal defense attorney decides not to challenge the accuracy of the fingerprint analysis? Now what? Here's a real life example of just such an instance.
In Cordero-Artigas v. State, the defendant was convicted of the manufacture of a controlled substance and possession of drug paraphernalia. 75 So.3d 838 (Fla. 2nd DCA 2011). Basically, he was convicted of owning a "grow house" for marijuana. It was Cordero's fingerprints that got him in convicted. The Sarasota Sheriff's Office had been watching a home for two months, suspecting it was a marijuana grow house. During these two months, only four people went onto the home's property, Cordero was one of them (though he was never actually seen entering the home, just the garage). Eventually, the police obtained a warrant to search the home, and as expected, marijuana plants were growing inside. Four people were charged.