Breaking NEWz you can UzE...
compiled by Jon Stimac
CSI Con-man Fools Judges
ELECTRIC NEW PAPER, SINGAPORE Feb 24,
2007 ...more than 700 cases to be reviewed because he posed
as forensic investigator...
Norfolk Accused's Prints 'found with body'
- Feb 19, 2007 ...fingerprints on a plastic sheet found
with victim's body belonged to the man on trial for her murder...
Reaction to the Report –
THE HERALD, UK
- Feb 16,
2007 ...reaction to the 11-month Justice 1
committee inquiry of the Shirley McKie case...
Led Police to Assault Suspect
JOURNAL TIMES ONLINE, WI
- Feb 16, 2007
...prints found in the school bathroom where a boy was sexually
assaulted led police to a suspect...
Recent CLPEX Posting Activity
containing new posts
Moderated by Steve Everist and Pat Wertheim
EmmaC Sun Feb 25, 2007 1:01 am
Justice1 member speaks out.
Daktari Sat Feb 24, 2007 5:51 pm
Justice 1 Reports
Daktari Sat Feb 24, 2007 4:35 pm
McKie Cops break silence?
Daktari Sat Feb 24, 2007 4:32 pm
Thank GOD for stupid crooks!
Cindy Rennie Fri Feb 23, 2007 7:43 pm
More Thoughts On Bias
Charles Parker Fri Feb 23, 2007 5:59 pm
Statistics and Misidentifications - The weeks Detail
Michele Triplett Fri Feb 23, 2007 8:19 am
RAM Dye Stain
Andrew Schriever Thu Feb 22, 2007 3:29 pm
Wayne Reutzel Thu Feb 22, 2007 12:02 pm
Life Expectancy of Dye Stains and QC Checks
M.Snyder Thu Feb 22, 2007 12:18 am
Daubert Debate in MD
L.J.Steele Wed Feb 21, 2007 11:15 am
Kicking and screaming into the 21st century.
Cindy Rennie Tue Feb 20, 2007 11:56 am
Mike Fletcher Mon Feb 19, 2007 9:59 pm
UPDATES ON CLPEX.com
updates on the website this week.
Cindy Rennie brought us notes on Daubert issues
from the recent ABFDE conference.
we look at a
review on MXRF related to latent print examination.
Excerpts from a term paper on Micro-X-Ray
by Genise Caruso
Purpose: Research and evaluate a novel [latent print development] method developed by University of
The technique, known as micro-x-ray fluorescence, (MXRF) was introduced at
the 229th national meeting of the American Chemical Society, in San Diego,
on March 13, 2005. Claimed to be revolutionary for detecting fingerprints
that are difficult to distinguish through conventional means, the process
may conceivably promote further use of fingerprinting as a forensic
investigational tool. (Bernstein, 2005)
Science Daily.com website was made in the class discussion area, and through
this website I discovered micro-x-ray fluorescence technology was recently
developed as a novel method for detecting fingerprints with great advantages
over methods that are known.
I had much difficulty finding useful data about MXRF. The information I did
come across all appeared to be duplicated from an article written as a
direct result of the research presented at the 229th national meeting of the
American Chemical Society, in March of 2005.
I sent an email directly to Mr. Christopher Worley, the lead scientist
responsible for the research on micro-x-ray fluorescence used in fingerprint
identification. If anyone could offer me the information I was seeking, he
was the one. Discouraged, as I did not get a response right away, my
patience paid off as he did finally reply and provide me with some very
Five researchers at Los Alamos National Laboratory in New Mexico, led by
analytic chemist, Christopher Worley, Ph.D. developed a new method using
X-ray technology that may greatly reduce or eliminate [many existing latent
print development] obstacles. Micro-x-ray fluorescence (MXRF) is a procedure
that employs spectroscopy, shown in [the below] figure, and while
spectroscopic technology, in general, isn’t new, this work was unique, as it
appeared to be the only known study concerning the actual detection of
fingerprints using MXRF. (Worley et al, 2006)
Bits of residue from things we touch, and human secretions like sweat, blood
or saliva, all contain certain chemical components, such as sodium and
potassium chloride. MXRF works by detecting fingerprints based on the
chemical ingredients connected to the residue, rather than by visible
contrast between the print and background, which isn’t always possible. MXRF
exposes the chemical markers, displaying ridge patterns of prints, allowing
a visible image to be “seen.” (Bernstein, 2005)
Saturating a specimen using a thin beam of X-rays is noninvasive and won’t
alter or damage [latent] prints like dusting can. Moreover, since MXRF is
based on detecting elements that are left from fingerprints and not the
actual prints themselves, it has the ability to uncover evidence on those
difficult to detect surfaces.
Worley and his associates succeeded in proving that using MXRF they were
able to detect prints unlikely to be discovered under normal assessment
methods. Of course this didn’t mean no limitations were found. MXRF has
shortcomings. It can’t detect every known element, and some prints just
don’t contain enough material to be identified even using this technology.
The equipment is very big, must accommodate the sample size, and doesn’t
offer capabilities at this time to analyze specimens on location, at the
Before it can acquire certification for use in U.S. crime labs, more studies
and work is necessary. Additional testing and fine-tuning is needed for
commercial use, especially since the current cost is $175,000. If all goes
well, Worley and his associates anticipate it could be available for use in
fingerprint detection sometime within this decade. He said, “This process
represents a valuable new tool for forensic investigators that could allow
them to nondestructively detect prints on surfaces that might otherwise be
undetected by conventional methods. It won’t replace traditional
fingerprinting , but could provide a valuable complement to it.”
A Kevex Omicron instrument (now owned by Thermo Electron) was used to
analyze a majority of the samples. An EDAX Eagle II XPL MXRF instrument was
used to compare or supplement the Kevex Omicron MXRF images collected from
several samples. The Eagle is available in two standard configurations:
Eagle II and Eagle II XPL. This table illustrates the basic components for
the Eagle II XPL. (EDAX, 2007)
Tube: 40 W X-ray tube (Mo or Rh)
Capillary Optics: X-ray Poly-capillary Lens (XPL) - 40 µm spot
Intensity is roughly 50 to 100 times that of 300 mm mono-capillary
Stage High Precision stage (3 to 5 µm)
Low Mag CCD 10x (B/W)
High Mag CCD 200 x (color)
Chamber: Standard large sample chamber:
Diameter: 330 mm (13.0") Depth: 350 mm (13.8")
Accepts samples up to 250 mm x 200 mm x 90 mm
Detector: 80mm Lithium-drifted Silicon crystal, liquid nitrogen cooled
Na to U simultaneous detection (Be window )
<155 eV resolution for MnKa @ 5000 CPS
<240 eV resolution for MnKa @ 100,000 CPS
Electronics: EDAX Data Acquisition Module (EDAM) III
High throughput digital pulse processor
Multi-DSP and SMT technology
PCI-bus based connection to CPU
Workstation: Windows NT-based workstation fully-integrated with EDAX Data
Acquisition Module via PCI interface System configuration and calibration
software, comprehensive qualitative and quantitative software, optional Line
scan and Mapping
Bernstein, M. (2005). New fingerprint visualization method uses Xrays to
reveal missing clues. EurekaAlert! Retrieved on January 23, 2007, from
CSI: X-Ray Fingerprints. (2006). Micro-x-ray fluorescence also provides
spectroscopic information. Science Insider. Retrieved on January 31, 2007,
EDAX. (2007). Hi-Tech Instruments. (HTI) Micro X-Rays Fluorescence System,
Eagle. Retrieved on January 23, 2007, from http://www.htiweb.com/Product_Infor/mXRF/mXRF_Infro.htm
Jones, W.D. (2005). X-ray vision picks up clues to crimes. Spectrum.
Retrieved on January 31, 2007, from http://www.spectrum.ieee.org/print/2672
Worley, C.G., Wiltshire, S.S., Miller, T.C., Havirilla, G.J., & Majidi, V.
(2006). Detection of visible on latent fingerprints using micro-x-ray
fluorescence elemental imaging. Journal of Forensic Sciences. Vol. 51, No.
1, Retrieved on January 31, 2007, from http://www.blackwell-synergy.com
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