Breaking NEWz you can UzE...
compiled by Jon Stimac
Matching Fingerprints to Felons
AURORA BEACON NEWS, IL
2007 ...AFIS is the highlight of the Illinois State Police
Bureau of Identification, which maintains fingerprint data and
criminal history for the entire state...
Fingerprints Snare Burglar 5 Years On
- Sept 5, 2007
...police snared suspect after they found his finger prints on a
pencil holder in the building...
Teachers Could Get Stuck With Tab for Fingerprints –
DALLAS MORNING NEWS, TX - Sept 8, 2007
...teachers could get stuck with tab related to background checks...
New York Suspect in '91 Murder Caught in Alabama
- Sept 7, 2007
were traced on a national crime database and matched those of the
Recent CLPEX Posting Activity
containing new posts
Moderated by Steve Everist
What Are Standards?
Charles Parker 24 Sun Sep 09, 2007 11:12 am
Here We Go Again: Objective Vs Subjective
Charles Parker 1042 Sun Sep 09, 2007 2:39 am
The Lockerbie Connection.
Iain McKie 19783 Fri Sep 07, 2007 11:50 pm
Statistics and Misidentifications - The weeks Detail
Michele Triplett 18460 Fri Sep 07, 2007 11:36 pm
radarmoose 128 Fri Sep 07, 2007 4:24 pm
General Electric v. Joiner
Charles Parker 1071 Fri Sep 07, 2007 12:27 pm
Processing tips for a Tyvek envelope
sandra wiese 85 Fri Sep 07, 2007 2:02 am
tell all job description for LPE in Colorado
sandra wiese 1836 Thu Sep 06, 2007 10:48 am
They Walk Among Us
Charles Parker 1560 Mon Sep 03, 2007 3:50 pm
UPDATES ON CLPEX.com
Updated the Fingerprint Interest Group web page with FIG # 12.
we looked at the Ridgeology Science Plus!
we look at a poster
presentation at the IAI Conference in San Diego regarding the development of
latent prints on porous surfaces through the steam application of a simple
solution of ninhydrin and distilled water. We also look at the SWGFAST
guidelines for validating a new or novel technique.
Steam Ninhydrin Development of
Posted on Wednesday, August 01, 2007, onin.com, by Ed German:
At the IAI's Annual Educational Conference during 22-28 Jul 2007 in San
Diego, Hee-Il Lee (Korea's representative to the IAI) presented novel
research about ninhydrin development without expensive or dangerous
solvents. Patent and other
rights to this information are reserved by Hee-Il Lee.
Hee-IL Lee dissolved 5 grams of ninhydrin in one liter of distilled water
using a magnetic stirrer, then put the aqueous ninhydrin solution in a
normal steam iron and rapidly developed good-quality latent prints with the
Hee-Il Lee also designed a special steam generation chamber for more uniform
development of aqueous ninhydrin solution latent prints on batches of
documents (or other porous surface evidence).
Patent and other rights to this
information are reserved by Hee-Il Lee.
Hee-Il Lee's poster presentation about his research was well-received. Many
of us are certainly looking forward to Hee-Il Lee's publication of the
technique in the Journal of Forensic Identification.
MEMBERS OF THE GENERAL PUBLIC SHOULD
NOT TRY THIS TECHNIQUE AT HOME!
In that this is novel research, safety precautions concerning exposure to
the ninhydrin-bearing steam should be discussed with laboratory safety
representatives. Exposure to ninhydrin-steam may cause temporary purple
discoloration (Ruhemann's purple) of your skin in some instances, and also
may pose inhalation and other safety hazards.
The Validation guidelines listed below for new latent print examination
techniques are posted at
under the topic
Validation of Research and Technology.
The purpose of validation is to ensure the integrity of
all techniques and procedures used for the
development of friction ridge detail in order to establish confidence in
those techniques and
procedures for the examiner and the scientific and legal communities.
General considerations for validation of technical techniques or procedures
development of friction ridge detail
1.1 Validation is the process used by the scientific community to acquire
information to assess the ability of a technique or procedure to reliably
desired result. Validation determines the conditions under which results can
obtained and determines the limitations of the technique or procedure. The
process identifies the critical aspects of the technique or procedure that
carefully controlled and monitored.
1.2 Prior to the implementation of the technique or procedure, validation
testing must be
1.3 Once a technique or procedure has been validated, appropriate
be available. (Refer to Appendices and Section 1.7).
1.4 The validation process includes:
1.4.1 Literature research: Review of publications, academic materials,
procedures and protocols, etc. involving the technique or procedure being
1.4.2 Standard samples: The samples should be selected to represent the type
specimens to be routinely analyzed by the technique or procedure.
1.4.3 Consistency: The methods tested and results must show the same outcome
on each test.
1.4.4 Reproducibility: The test must be reproducible by another individual
the original test documentation.
1.4.5 Environmental Studies: When applicable, evaluate the method using
samples exposed to a variety of environmental conditions.
1.5 Validation of Established Technique or Procedure (see Appendices A and
1.5.1 Internal Validation
Prior to implementing an existing technique or procedure, the reliability of
the technique or procedure must be demonstrated. This internal validation
SWGFAST page 2 of 8 Validation of
08/08/01 ver. 1.0 Research and Technology
18.104.22.168 The techniques and procedures must be tested using
similar samples and conditions as those being
22.214.171.124 If a modification has been made, the modification must be
compared to the original technique or procedure using
126.96.36.199 Consistency and reproducibility must be determined by
repetitive analyses, preferably by different individuals.
1.6 Validation of New or Innovative Techniques or Procedures (see Appendix
1.6.1 Internal Validation
Prior to implementing a new or innovative technique or procedure, the
reliability of the technique or procedure must be demonstrated. This
internal validation must include:
188.8.131.52 The techniques and procedures must be tested using similar
samples and conditions as those being examined.
184.108.40.206 If a modification has been made, the modification must be
compared to the original technique or procedure using identical
220.127.116.11 Consistency and reproducibility must be determined by repetitive
analyses, preferably by different individuals.
1.6.2 External Validation
Validation studies must have been completed by a scientific, scholastic,
and/or professional organization other than that of the immediate
organization prior to the implementation of the technique or procedure.
1.7 All validation must be documented
1.7.1 Documentation must be sufficient to ensure that any qualified
could evaluate what was done and replicate the validation process.
1.7.2 Documentation must be in the form of either laboratory notes, reports,
laboratory books or log books, which should include references, personal
1.7.3 Documentation of external validation must identify the name and
professional affiliation of the person(s) conducting the study, date, as
as the research question, procedures, results and conclusion(s).
SWGFAST page 3 of 8 Validation of
08/08/01 ver. 1.0 Research and Technology
The following is an example of a guideline for validation testing of an
established technique or
procedure, using a formulation prepared by the tester or a member of the
Purpose: Detection of latent prints on specific surface type or specific
latent print residue.
Materials: Chemicals, lab ware and incidental materials required for
Safety: Review all safety procedures prior to beginning validation testing,
preparation, application, storage and disposal of chemical and biohazard
Formula: State formula being used.
Procedure: To include step by step methods used in testing the technique or
as well as time increments, environmental conditions (i.e., humidity, heat,
atmospheric), formulations, amounts and materials, when applicable.
Results: Descriptive observation(s) of the test.
Conclusion: Discussion or evaluation of the results and effect(s) of the
procedure on the development of latent prints or above stated purpose.
Reference: List source(s) for procedure, technique and formulation.
Validation: List name of individual(s) who conducted validation, their
title, agency of
individual(s) and date of validation.
(additional examples are provided on the SWGFAST website)
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!