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NIJ/NIST Expert Working Group on Human Factors in Latent Print Analysis

The Latent Process Process Mapping as a Valuable Technique for Understanding Activities that Pose the Greatest Risk for Errors. NIJ/NIST Expert Working Group on Human Factors in Latent Print Analysis. Melissa R. Gische Forensic Examiner FBI Laboratory June 2011. ANALYSIS.

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NIJ/NIST Expert Working Group on Human Factors in Latent Print Analysis

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  1. The Latent ProcessProcess Mapping as a Valuable Technique for Understanding Activities that Pose the Greatest Risk for Errors NIJ/NIST Expert Working Group on Human Factors in Latent Print Analysis Melissa R. Gische Forensic Examiner FBI Laboratory June 2011

  2. ANALYSIS • Level 1, 2, and 3 detail • Substrate • Matrix • Development method • Deposition pressure • Lateral movement

  3. Individual Characteristic Information Single characteristics contain multiple types of information Location Type Direction Spatial Relationship

  4. Substrate, Matrix and Development Medium Substrate is the surface on which a friction ridge impression is deposited Matrix is the material coating the friction ridges that can be deposited by the finger. Textured Glass Bottle Sweat Development medium is the substance with which the matrix reacts that makes the print visible Superglue

  5. Deposition Pressure Light Medium Heavy Extreme Amount of pressure exerted when print is deposited

  6. UNKNOWN ANALYSIS Yes

  7. ANALYSIS

  8. Recommendations being considered • Documentation to make this part of the process more transparent • Research to develop Analysis metrics

  9. 10-PRINT CARD(KNOWNS) UNKNOWN COMPARISON UNKNOWN TO EVALUATION

  10. 10-PRINT CARD(KNOWNS) UNKNOWN COMPARISON UNKNOWN → TO 2nd LEVEL

  11. COMPARISON A target group is a unique group of friction ridge details that stands out enough for an examiner to easily memorize… [1] UNKNOWN KNOWN

  12. COMPARISON Yes UNKNOWN KNOWN

  13. COMPARISON EVALUATION

  14. Recommendations being considered • Individualization • Refrain from making a source attribution to the exclusion of all other individuals in the world • Training in probability theory

  15. Recommendations being considered • Research accuracy and variability of examiner conclusions • Database(s) of prints to conduct this research

  16. Recommendations being considered • Comprehensive testing program, including competency, certification, and proficiency • Continuing education • System to identify errors, investigate the cause, and track both • Change in culture regarding error

  17. Questions?

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