Breaking NEWz you can UzE...
compiled by Jon Stimac
Rail Vandal Caught by Fingerprints Left on a Beer Bottle –
THE WHARF, UK - July 25, 2007
...it was fingerprints left on the bottle that provided the final
piece of evidence needed to bring him to court...
No Fingerprints on Guns Used to Kill
2007 ...a fingerprint expert told the court
that the suspect's fingerprints were not found on the murder-weapon...
Would You Buy Groceries With A Fingerprint?
THE CONSUMERIST, NY
2007 ...after signing up and associating your fingerprint
with your credit card, you can buy groceries...
Fingerprints Foil His Attempt to Assume Her Identity in
ORLANDO SENTINEL, FL
- July 21, 2007
"...he fooled us...but fingerprints do not lie..."
Recent CLPEX Posting Activity
containing new posts
Moderated by Steve Everist
Latent Print Examiner Positions - CONUS/OCONUS
wkpetroka 1559 Mon Jul 30, 2007 12:46 am
The Lockerbie Connection.
Iain McKie 11014 Sun Jul 29, 2007 11:49 pm
Statistics and Misidentifications - The weeks Detail
Michele Triplett 12658 Sun Jul 29, 2007 11:40 pm
San Diego IAI Conference
Steve Everist 69 Sun Jul 29, 2007 4:43 pm
New Fingerprint Technique Could Reveal Diet, Sex, Race???
nctindle 439 Fri Jul 27, 2007 12:20 am
Brian Moline 478 Thu Jul 26, 2007 8:07 pm
MIDEO digital photography system
Pat A. Wertheim 826 Thu Jul 26, 2007 6:21 pm
tell all job description for LPE in Colorado
sandra wiese 1184 Thu Jul 26, 2007 12:02 am
Bill 761 Thu Jul 26, 2007 12:00 am
need help from CA AZ and NM clpex peeps, please
sandra wiese 145 Wed Jul 25, 2007 11:58 pm
Interesting Tidbit 3
Charles Parker 621 Tue Jul 24, 2007 12:28 am
UPDATES ON CLPEX.com
No major updates to the website.
many of us attended the IAI conference in San
Diego. It was the largest IAI conference ever with over 1,600
attendees! More to come on subjects covered throughout the week.
we take a look at the
concept of color blindness and latent print examination.
Color Blindness in Latent Print Examiners
by Pat Wertheim
At the fall meeting of the Scientific Working Group on Friction Ridge
Analysis, Study, and Technology (SWGFAST) in 1999, a discussion of physical
traits of fingerprint examiners included the topic of color blindness. Some
of the members wondered whether examiners should not have a good ability to
distinguish colors. My personal situation is that while I believe I can see
colors correctly, I have never been able to pass all of the color tests
during an eyesight examination. I have what I believe is commonly called
“red-green color blindness.” It usually shows up on the color tests with the
hidden numbers in patterns of different colored polka dots. I cannot find
most of those hidden numbers. Whatever the technical name of the condition,
I am color blind to some degree.
However, I know from looking at latent prints, photographic enlargements,
and images on computer screens that I can detect subtle differences in
shades of gray that other examiners cannot see. I can frequently see ridge
endings very clearly that another excellent latent print examiner in our
laboratory has great difficulty pinpointing, unless she first enhances the
latent print image to darken the ridges and lighten the furrows. It is plain
to both of us that my eyes are more sensitive than hers when it comes to
being able to distinguish between close shades of gray. On the other hand,
her ability to distinguish between colors is markedly better than mine,
especially with tan, light brown, beige, etc.
The light sensitive receptors in the retina of the eye are called rods and
cones. They “fire” when struck by light and send impulses to the brain,
where an image is formed. Rods are hundreds of times more sensitive than
cones, but they only “see” light in its overall intensity and in shades of
black and white and gray. Simply put, cones work better in bright light and
are the receptors that allow us to see color. Rods, on the other hand, work
very well in dim light but they do not see color. One effect of this is that
people with more than the average concentration of rods and fewer cones are
“color blind” to the degree the rods predominate. Another effect of a
predominance of rods is better night vision. Still another effect, this one
of special interest to latent print examiners, is a better than average
ability to distinguish between very close shades of gray.
There are other conditions related to vision that affect a latent print
examiner’s ability, such as form blindness and dyslexia. An examiners
ability to memorize and compare ridge detail between two images would be
adversely affected by either of these conditions. The mild presence of
either of these conditions might not prevent a person from becoming a good
latent print examiner, but the more serious the condition, the harder the
latent print examination would be for that examiner.
There are a number of technical and medical terms referring to different
deficits in color sensitivity. But experience and study (sources not noted)
indicate that color blindness is almost certainly not an impediment to
latent print examination and can, most likely, be an asset.
Feel free to pass The Detail along to other
examiners. This is a free newsletter FOR latent print examiners, BY
latent print examiners.
There are no copyrights on The Detail, and the website is open for all
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Until next Monday morning, don't work too hard or too little.
Have a GREAT week!