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Author Topic:   Is Fingerprint Analysis a Science?
Rahvin
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Posts: 4046
Joined: 07-01-2005
Member Rating: 7.6


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Message 10 of 38 (644129)
12-15-2011 12:17 PM
Reply to: Message 6 by Jon
12-15-2011 9:01 AM


It's disturbing that such horribly inaccurate identification methods are allowed in court, where they can be used to completely alter another person's life.
Eyewitness testimony is roughly as bad.
Trial by jury sounds like a great idea, but frankly juries terrify me because the average person will often weigh the least reliable evidence as the most damning. Having been on a jury once served only to make that fear worse.

The human understanding when it has once adopted an opinion (either as being the received opinion or as being agreeable to itself) draws all things else to support and agree with it.
- Francis Bacon
"There are two novels that can change a bookish fourteen-year old's life: The Lord of the Rings and Atlas Shrugged. One is a childish fantasy that often engenders a lifelong obsession with its unbelievable heroes, leading to an emotionally stunted, socially crippled adulthood, unable to deal with the real world. The other, of course, involves orcs." - John Rogers

This message is a reply to:
 Message 6 by Jon, posted 12-15-2011 9:01 AM Jon has replied

Replies to this message:
 Message 11 by NoNukes, posted 12-15-2011 1:12 PM Rahvin has not replied
 Message 12 by Jon, posted 12-15-2011 1:27 PM Rahvin has not replied

  
Rahvin
Member
Posts: 4046
Joined: 07-01-2005
Member Rating: 7.6


Message 14 of 38 (644145)
12-15-2011 2:16 PM
Reply to: Message 13 by Straggler
12-15-2011 1:40 PM


Surely this is just a question of technology. A sufficiently advanced pattern matching algorithm could surely allow computers to do all the matching required and to rigorously determine the statistical likelihood of error based on the quality of any given fingerprint.
If the premise of fingerprint matching is sound but human involvement in matching is the failing here then that can be technologically overcome.
I wonder at the actual training received by the fingerprint analysts, and whether they themselves are actual trained scientists.
But I think the real problem is how fingerprints are presented to juries. Like with DNA, a typical jury member is going to just say "well, his prints were there, so he did it," without understanding the relative probabilities involved when dealing with fingerprint analysis. The print card may have a nice set of prints, but the prints you leave on an object through normal contact aren't nearly so clear. When the jury hears "it was a match," I'm not sure that they are actually told how much of a match the prints are.
A positive match on 25% of a thumbprint is useful information, but it's not as significant as a match to multiple different full prints ( > 80% latents for both thumb and forefinger, for example). I don't think the average jury member thinks along those lines unless the defense has an expert who specifically directs them that way.

The human understanding when it has once adopted an opinion (either as being the received opinion or as being agreeable to itself) draws all things else to support and agree with it.
- Francis Bacon
"There are two novels that can change a bookish fourteen-year old's life: The Lord of the Rings and Atlas Shrugged. One is a childish fantasy that often engenders a lifelong obsession with its unbelievable heroes, leading to an emotionally stunted, socially crippled adulthood, unable to deal with the real world. The other, of course, involves orcs." - John Rogers

This message is a reply to:
 Message 13 by Straggler, posted 12-15-2011 1:40 PM Straggler has replied

Replies to this message:
 Message 16 by NoNukes, posted 12-15-2011 10:46 PM Rahvin has not replied
 Message 18 by Trixie, posted 12-16-2011 5:50 AM Rahvin has not replied
 Message 20 by Straggler, posted 12-16-2011 8:10 AM Rahvin has not replied

  
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