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Monday, September 10, 2007

 
The purpose of the Detail is to help keep you informed of the current state of affairs in the latent print community, to provide an avenue to circulate original fingerprint-related articles, and to announce important events as they happen in our field.
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Breaking NEWz you can UzE...
compiled by Jon Stimac

Matching Fingerprints to Felons AURORA BEACON NEWS, IL - Sept 3, 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 CHAD.CO.UK - 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 NEWSDAY, NY - Sept 7, 2007  ...fingerprints were traced on a national crime database and matched those of the suspect...

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Recent CLPEX Posting Activity
Last Week's Board topics 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

rtx
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

(http://clpex.com/phpBB/viewforum.php?f=2)
 

 
UPDATES ON CLPEX.com


Updated the Fingerprint Interest Group web page with FIG # 12.

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Last week

we looked at the Ridgeology Science Plus! workshop.

This week

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.

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Steam Ninhydrin Development of Latent Prints

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.

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 steam.
Patent and other rights to this information are reserved by Hee-Il Lee.

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 www.swgfast.org 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.

1. VALIDATION
General considerations for validation of technical techniques or procedures for the
development of friction ridge detail

1.1 Validation is the process used by the scientific community to acquire the necessary
information to assess the ability of a technique or procedure to reliably obtain a
desired result. Validation determines the conditions under which results can be
obtained and determines the limitations of the technique or procedure. The validation
process identifies the critical aspects of the technique or procedure that must be
carefully controlled and monitored.

1.2 Prior to the implementation of the technique or procedure, validation testing must be
conducted.

1.3 Once a technique or procedure has been validated, appropriate documentation must
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, safety
procedures and protocols, etc. involving the technique or procedure being
validated.

1.4.2 Standard samples: The samples should be selected to represent the type of
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 using
the original test documentation.

1.4.5 Environmental Studies: When applicable, evaluate the method using known
samples exposed to a variety of environmental conditions.

1.5 Validation of Established Technique or Procedure (see Appendices A and B)

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
must include:

1.5.1.1 The techniques and procedures must be tested using
similar samples and conditions as those being
examined.

1.5.1.2 If a modification has been made, the modification must be
compared to the original technique or procedure using
identical samples.

1.5.1.3 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 C)

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:

1.6.1.1 The techniques and procedures must be tested using similar
samples and conditions as those being examined.

1.6.1.2 If a modification has been made, the modification must be
compared to the original technique or procedure using identical
samples.

1.6.1.3 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 individual
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
communications, etc.

1.7.3 Documentation of external validation must identify the name and
professional affiliation of the person(s) conducting the study, date, as well
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

APPENDIX A
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 testing organization.

Purpose: Detection of latent prints on specific surface type or specific component of
latent print residue.

Materials: Chemicals, lab ware and incidental materials required for preparation and
use.

Safety: Review all safety procedures prior to beginning validation testing, including
preparation, application, storage and disposal of chemical and biohazard
materials.

Formula: State formula being used.

Procedure: To include step by step methods used in testing the technique or procedure,
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 technique or
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)

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Until next Monday morning, don't work too hard or too little.

Have a GREAT week!