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Monday, January 12, 2009

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.
Breaking NEWz you can UzE...
by Kasey Wertheim
Fingerprint leads to murder charges in 44-year-old case
San Bernardino Sun, CA - 10 hours ago
During the investigation, officers collected evidence from the scene, such as bloody fingerprints, according to Santa Ana police. At the hearing last week, ...
On the job wth Francis Senese
Southtown Star, IL - 10 hours ago
How does he link fingerprints to a case? Senese said any fingerprints developed are preserved photographically so they can be used in a comparison. ...
New College prof helps land National Institute of Justice grant
Arizona State University, Tempe - Jan 8, 2009
McQuiston-Surrett is one of three ASU faculty who are among the first scholars to study how jurors respond to fingerprints, bite marks, tool marks, ...
Trial of two men accused of killing family of four on Florida's ..., FL - Jan 4, 2009
The government's case relies on video surveillance, cell phone records and fingerprints a chain of evidence prosecutors hope will convince jurors Troya ...

Recent CLPEX Posting Activity
Last Week's Board topics containing new posts
Moderated by Steve Everist and Charlie Parker

Public CLPEX Message Board
Moderated by Steve Everist

IAI Conference Topics -
Tampa Bay, Florida - 2009:
Moderator: Steve Everist

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Documentation issues as they apply to latent prints
Moderator: Charles Parker

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  • ___________________________________
    Historical topics related to latent print examination
    Moderator: Charles Parker

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    Updated the Fingerprint Interest Group (FIG) page with FIG #77; Potential Double Tap by I. Farrell of Texas.  You can send your example (anonymously if you desire) of unique distortion through Charlie Parker:  For discussion, visit the forum FIG thread.

    Updated the Detail Archives

    Last week

    We started off 2009 with a light Weekly Detail from the Chat Board.

    This week

    we review three recently posted SWGFAST updates from the website, ( The text of the two represented below is for convenience only, and the original document should always be obtained and referenced from the SWGFAST website for official purposes.

    Newly Approved and Posted Documents

    • Model Policy for Friction Ridge Examiner Professional Conduct    
      (12/23/08 ver 1.0)
    • Preamble

      Practitioners of the friction ridge examination discipline shall regard themselves as members of a noble and honorable profession. It is their duty to serve the interests of justice to the best of their abilities at all times. They will be guided by those practices and procedures which are generally recognized within the profession to be consistent with a high level of professionalism. Their motives, methods, and actions shall at all times be above reproach and consistent with proper ethical conduct. Professional conduct contrary to the principles outlined in this model policy should be referred to an appropriate enforcement authority.

      1 Practitioners shall cooperate with other forensic science professionals in order to promote the advancement of the friction ridge examination discipline through scientific research. Knowledge of any new discoveries, developments or techniques applicable to the friction ridge examination discipline shall be shared with the peer community.

      2 Practitioners shall not undertake examinations or offer testimony if unqualified to do so.

      3 Qualifications of expertise are based on knowledge, skill, education, experience and training, and shall not be misrepresented by the practitioner.

      4 Examinations shall be conducted utilizing accepted scientific techniques and methods which are reliable, accurate and used with appropriate standards and controls.

      5 Techniques and opinions shall be based on facts and interpretations and shall not be knowingly misrepresented.

      6 Testimony shall be rendered in an impartial manner to promote the understanding of examinations and findings.

      7 Privileged communications shall be kept confidential.
    • _________________________________________
    • Standard for Friction Ridge Digital Imaging    
      (12/23/08 ver 1.0)


      These standards shall be applied to the digital recording and depiction of friction ridge impressions that are to be used for examination purposes. These standards do not extend to image adjustments on an AFIS system. Policies and procedures must be in place for the digital capture, storage, retrieval, display, and transmission of friction ridge images retained as evidence. This standard establishes requirements for the preservation of identity, authenticity, integrity, and security of friction ridge digital images. Prior to conducting digital imaging tasks in friction ridge examination cases, examiners shall have completed
      training appropriate to each task before them.

      1 Policies
      Agencies shall establish policies to determine which friction ridge digital images will be retained as evidence.

      2 Image Documentation
      Friction ridge digital images, documentation, or associated data shall include the following:

      2.1 A unique case identifier. This association may be accomplished by one or more of the following methods:
      2.1.1 As part of the digital image.
      2.1.2 As part of the file name.
      2.1.3 As data associated with a digital image within an imaging database.
      2.1.4 As data associated within a standardized record (i.e., ANSI NIST, Record Level 2).

      2.2 Date and initials or personal marking.

      2.3 Description or identifier of the item bearing the friction ridge impression.

      2.4 Information about the orientation or position of the friction ridge impression on the object through description, diagram(s), or photograph(s).

      2.5 Scene location or address, if other than the laboratory.

      2.6 Accurate scale information.

      2.7 Make and model of the capture device.

      3 Image Quality

      3.1 Friction ridge impressions to be used for comparison purposes shall be captured (color or grayscale) at a minimum of 1000 ppi optical resolution when the image is sized 1:1. Justification for any deviation from this standard shall be documented on a case-by-case basis.

      3.2 Grayscale digital imaging shall be at a minimum of 8 bits. Color digital imaging shall be at a minimum of 24 bits.

      3.3 Friction ridge impression digital images to be used for comparison purposes shall be stored and transmitted without compression or with lossless compression. Capture in a raw file format is recommended.

      4 Image Integrity

      4.1 A primary image is the result of the first recording of an image onto media. An original image is an accurate replica (bit-for-bit value) of the primary image. Each original image shall be stored in a manner which permits authentication.

      4.2 Enhancement shall only be conducted on working copies of the original image. Working copies used in forensic case examination shall be saved as a separate copy and shall not replace the original image.

      4.3 Digital images captured from lifts or from conventional photographs or negatives shall not replace the lift, negative, or photograph as original images.

      4.4 Agencies shall have procedures to ensure the accessibility of digital images (e.g. images may be archived in a format to ensure their accessibility, hardware and software may be archived to ensure accessibility of images [1]).

      5 Casework Documentation

      5.1 Procedures shall be in place to ensure the accuracy and completeness of documentation.

      5.2 Casework documentation shall distinguish friction ridge impression digital images from lifts or photographs.

      5.3 The application of digital image processing (enhancement) techniques shall be documented. This documentation shall be sufficient to enable evaluation or replication of the digital image processing techniques.

      6 References

      1. SWGIT, Best Practices for Archiving Digital and Multimedia Evidence (DME) in the Criminal Justice System, 6/4/07, ver. 1.0, (

      Standard for Simultaneous Impression Examination    
      (12/5/08 ver 1.0)
      text and images preclude posting here - please reference this document from the SWGFAST website:



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    Have a GREAT week!