The National Latent Print Examiner Training Academy

WEEK 16 - COMPARISON AND EVALUATION SKILL DEVELOPMENT
This was a week dedicated to increasing the abilities of the students in their comparisons and evaluations. We significantly increased the difficulty of the in-class comparison exercises. We broke away from traditional training exercises, and worked through comparisons from casework to give the students a good idea of the level of difficulty they can expect while working in a laboratory.

We worked through 40 latent prints on orientation. We then stepped up the level of difficulty on value determinations of latent prints. The students were guided through correct and incorrect answers on value/ no value.

This week hit hard on exclusions. Exercise after exercise, the students were given two sets of knowns; one of which they needed to exclude, and the other was an identification. They were pushed to find observable differences prior to rendering an exclusion decision. Then if harder prints, on-screen comparisons, orientation exercises, value determinations of borderline prints, and exclusions were not enough, the students were given level 3 detail comparisons with multiple exercises for pores, edges of ridges, and incipient ridges. The comparisons were broken up this week with lectures and exercises on forged and fabricated latent prints. 
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WEEK 15 - COURTROOM TESTIMONY TECHNIQUES - SUCCESS INSTEAD OF SURVIVAL
The focus of this week was bringing the students up to speed on general issues regarding courtroom testimony. These topics included discussions about the courtroom and witness room environment, courtroom procedures, understanding the courtroom itself, and how to move and function within the courtroom. How to understand direct examination and how to handle evidence prior to and after admission were also covered. A significant portion of the class was spent on understanding the role of judge, prosecutor, defense counsel, and the jury. Students were carefully instructed on how to develop a trusting relationship with the jury as part of their duties as a witness.

Multiple examples of defense strategies and methods of cross examination were demonstrated for the class as well as the methods of handling cross examination in the most professional manner. This class serves as a precursor for the expert witness testimony segment of the academy which comes later on in the schedule.
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WEEK 14 - Understanding Simultaneous & Distorted Impressions
Week #14 was focused on the topic of simultaneous impressions and latent print distortion. This was a great week for this topic as the students were fresh off last week’s topic of ACE-V methodology and documentation.

The following topics/concepts were covered, discussed and applied during Week #14.
1) How the surface and substrate can affect the latent impression
2) How developments techniques can affect the latent impression
3) How the skins responds/reacts to pressure(elastic deformation)
4) What causes the skin to react in a predictable way(structure of the skin and hand)
5) What is meant by “Stick Zone”, premature and gross slip
6) The effects of vertical pressure on the impression(deposition pressure / compressive stress)
7) The effects of lateral pressure/movement on the impression(tangential stress)
8) Types of lateral pressure/movement(shearing stress and torque)
9) How the ridges react to this type of movement(imbrication / compression / expansion)
10) Tonal reversals and what causes them
11) The difference between discrepancies and distortion or variation
12) Understanding the terminology Red Flags
13) Understand the terminology used when conducting simultaneous impressions
14) Understanding simultaneous impressions past and present
15) Understand current research on simultaneous impressions
16) Understand the court rulings on simultaneous impressions (review of Commonwealth v Patterson)
17) Understand the logic behind the conclusion of simultaneity
18) Understand the uses of simultaneous impressions in casework
19) Understand the SWGFAST standard for simultaneous impression examination
20) Practical exercises on simultaneous impressions

The students were able to get a much better understanding of simultaneous and distorted impressions by the end of the week. It was also beneficial to have them utilizing the newly acquired information to document the distortion for each impression and then use that to help them conduct their comparisons. The greater understanding the students gain on distortion, of all types, will eventually help them in understanding why latent prints appear as they do, their analysis of those latent prints, and how to explain distortion by the clues; thereby, giving the examiner the tools and vocabulary necessary to document and explain the variances that they experience in latent prints.
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WEEK 13 - ACE-V Methodology, Examination Documentation Best Practices and Conclusions
We started the week with a review of the analysis phase of the ACE-V method, and covered the correlation between ACE-V and the scientific method.  We broke down the evaluation phase, the conclusions that are acceptable in the discipline, and why.  We also discussed the verification phase and discussed pro’s and con’s of verifying all conclusions and also of blind verification.  We covered the Monty Hall Problem as a segue into statistics, error rates, probabilities, and likelihood ratios.  We covered the difference between probabilities and statistics, how statistics are being used in research to try to determine error rates, and some examples of the research that has been conducted.  We also discussed probabilities, and how likelihood ratios are being used to try to develop probability models that look at the likelihood of another individual “sharing” ridge characteristics.  We calculated mean, median, mode, range, and standard deviation.  Then we talked about measurements; what they are and what they aren’t.  We calculated a basic uncertainty of measurement, and discussed how different K values can change the percent certainty of a reported measurement.  Then we hit the standards hard.  We covered ISO/IEC 17020 and ISO/IEC 17025 standards.  We dove into some specific technical standards for ISO/IEC 17025.  We discussed the roles of the accrediting bodies including ANAB, ASCLD/LAB, and A2LA.  We did a practical exercise of each examiner reading their agency’s policies and procedures, and answering ten questions to develop a basic process map for their laboratory and latent print section.  We also covered what information is typically kept in a case file.  Finally, what would a week of ACE-V, documentation, best practices, and conclusions be without a solid look at the NAS report, the role of the DOJ and the National Commission on Forensic Science, the role of NIST and the OSACs, and of course what SWGFAST was, why it existed, and where the discipline of latent prints is headed?  It would be an incomplete week, so we covered it all.
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WEEK 12 - COMPARISON & EVALUATION SKILL DEVELOPENT / EXCLUSION & INCONCLUSIVE DECISIONS
It was good having the students back at the academy for the first class of 2017 and after being on Christmas break since December 23, 2016.  This week a lot of time was spent working on comparison exercises and helping the students get back into academy mode. 

This week’s lecture was spent discussing the standards for conclusions.  The students discussed the following topics. 

1) Sufficiency and for what purpose (ID or Comparison)
2) Reproducible target groups
3) Identification / Individualization
4) Exclusion / Elimination
5) Inconclusive / Insufficient
6) What is enough?
7) Specificity
8) Quantity/Quality Spectrum
9) One discrepancy and Close non-matches
10) Type 1 (false positive) and Type 2 (false negative) errors
11) Exclusion research
12) 100% review/verification
13) Appropriate reasons for an Inconclusive decision
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WEEK 11 - Digital Imaging for Latent Print Examiners
The students were instructed in Adobe Photoshop and iDs. The students learned about file types and formats, and the benefits of working with RAW images. The students were also instructed in both workflow and image processing with the Adobe RAW converter and Adobe Bridge.  We also did a lot of hands-on image processing using all of the following techniques:

- levels
- curves
- masks
- black and white adjustments
- adjustment layers
- blending modes
- selections
- sharpening techniques
- changing color formats
- channels
- shadows
- highlights
- calculations
- iDs easy buttons
- dodge
- burn
- image rotation
- rulers
- noise removal
- image calibration
- color subtraction
- multiple crops
- text, lines, and arrows
Of huge importance, we covered some tools that should not be used in latent print work including the healing brush tool and clone stamp tool.  The students received their first in-depth opportunity at on-screen comparisons, and were allowed to use the software of their choice.
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WEEK 10 - RECORDING OF KNOWN IMPRESSIONS (Ink and Livescan)
Week 10 focused on the recording of known exemplars for use in latent print comparisons.  During the first part of the week, the class focused on collecting known exemplars with printer’s ink.  The students collected standard fingerprints, palm prints, and Complete Friction Ridge Exemplars (Major Case Prints).  The use of alternate ink and chemical methods as well as the use of powders and livescan technology were also explored.

Later in the week, the students had the opportunity to collect known footprint (plantar) exemplars using several different inking and powder methods.  The students also took a close look at the patterns of the plantar surface and the distributions of those patterns as covered during week 9.

The week concluded with an in depth discussion and practical exercises on obtaining postmortem exemplars under various conditions.  The students practiced using postmortem spoons as well as other methods such as Mikrosil and powder.
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WEEK 9 - AFIS Minutiae Plotting, Automated Searching & Candidate Reviews, and Plantar Impressions
Week 9 focused on automation and how it affects examiners on a daily basis. The students learned about the need for and the history of automation. This included the evolution of livescan and Automated Fingerprint Identification System (AFIS). Multiple AFIS platforms were explored.

Everyone had the opportunity to mark fingerprint minutiae using the Universal Latent Workstation (ULW) software. The students were also able to enter and search latent prints against a robust fingerprint and palm print database using a fully functional AFIS, the AFIX Tracker from AFIX Technologies.

Later in the week, the students learned about the unique ridge flow characteristics of plantar impressions (bare footprints). They were given a comparison exercise consisting of 9 sets of known footprint exemplars and 25 latent prints of varying quality.

The week concluded with demonstration of livescan technology for capturing and transmitting fingerprints and palm prints.
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WEEK 8 - EVALUATION OF LATENT FINGERS, PALMS, TIPS, JOINTS, AND SUFFICIENCY DECISIONS
This course was designed to teach the participant the fundamentals of fingerprint examination through practical exercises, lectures and discussions. An understanding of the analysis and comparison processes was included as well as the concepts of sufficiency, prints of value, ACE-V methodology, orientation and reporting conclusions.

Practical exercises on value, sufficiency, and the comparison of fingers, palms and joints were conducted throughout the course.

An understanding of courtroom preparation including the use of PowerPoint and charted enlargements were introduced in this course and the students did a short presentation for the class.

A group discussion on the NAS report was provided to give the students an overview of the current and future challenges in the fingerprint and forensic fields.
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WEEK 7 - COMPARISON AND EVALUATION SKILL DEVELOPMENT
This week was dedicated to increasing the comparison skill set of the students. Therefore, the majority of the week was spent working on comparisons exercises.

The beginning of the week started off with lecture on searching smart clues, which seemed to be a good refresher. Other topics covered early on were skin diseases and abnormalities and fingerprint mutilation (past and present).

Also, at the beginning of the week, the students were given some visual tests specifically designed to determine their ability to see contrast differences in black/white/gray and color.

Later in the week there was lecture on examiner ability, form blindness, types of bias, ethics and criminal behavior (with past case examples of mistakes in forensics), how vision works, perception/illusions, mind set, memory and how all of these can play into the mind of the examiner before and during the examination. This lecture was specifically placed to reinforce the concepts utilized in the tests given earlier in the week in an attempt to bring the two together. It is hoped that the students learned a lot about what goes on in the mind of an examiner prior to examination, during the examination and at the moment of decision.

Hope everyone has a Happy Thanksgiving.

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WEEK 6 - ESSENTIAL RIDGEOLOGY CONCEPTS
This course was designed to continue to grow the student’s knowledge base as we dove head-long into the science behind the uniqueness and persistence of friction ridge skin. We covered ridgeology theory and technique, embryology, histology, glands, secretions, wound healing, and diseases of the skin in an attempt to grow the confidence of the students in the science behind their conclusions.  We spent a lot of time on the analysis phase of ACE-V and practically applying it to images of latent prints.  Significant effort was put toward searching smart, orientation, target group selection, and methods of comparisons. The students worked through a comparison exercise of 20 latent prints.  These latent prints were the most difficult they had received to date.
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WEEK 5 - ADVANCED PALM PRINT COMPARISON TECHNIQUES
Ron Smith spent the majority of the week providing detailed instruction to the class on the specific nuances of palm prints to include ridge flows, crease formations, latent palm print shapes, and combinations of all of these in various levels of difficulty.

Numerous practical exercises and individual palm print challenges were completed, some of which had to be defended by each and every member of the class. No sitting back in the shadows in Ron's Class!

At the end of the week, the students were presented with a final challenge for the week which included a written exercise of 50 very specific questions about palms along with a visual evaluation of 20 partial latent palm prints in which the palmar area of origin, which hand, and correct up and down position had to be determined.  This allowed for three potential errors for each latent print, and understandably, the students were more than pleased when they could tell Ron good-by for the week.

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WEEK 4 - ALS/LASER AND ADVANCED LATENT PRINT PROCESSING
This course was designed to teach the participant the fundamentals of latent print development techniques for porous and non-pours items of evidence as well as exhibits that are not so routinely submitted to the laboratory for latent print processing through practical exercises, lectures, and discussions in a state of the art laboratory.

An understanding of the following principles were taught and applied through hands on workshops:
  • Porous latent print processing techniques such as 1,2-Indanedione, DFO, Ninhydrin, Oil Red O and 5-Methylthioninhydrin (5-MTN). This section included thermal paper processing as well.
  • Blood specific latent print development techniques such as amido black, leucocrystal violet, titanium dioxide and acid yellow.  Techniques to processes latent prints in blood on difficult and problematic surfaces.
  • Processing techniques that included best practices for removing different types of tape from evidence and best practices for various substrates that the tape could be on.  Also, processing the adhesive side for latent prints using sticky side powder, TapeGlo and Gentian Violet.
  • Processing techniques for complex surfaces and multiple substrate challenges and the techniques to apply proper sequential processing practices. 
  • Processing techniques for oily and greasy items of evidence with latent print development techniques using sudan black and best practices for developing latent prints on thermal paper receipts.
  • Students research literature and performed literature reviews to investigate how to process challenging items of evidence and methods to perform validation studies.
Students had the opportunity to work in groups processing items that they will encounter quite often and not so often in their career.
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WEEK 3 - DIGITAL IMAGING BASICS: FROM CRIME SCENE TO THE LABORATORY
Week #3 was dedicated to the fundamentals of photography. The course covered essential techniques for capturing high resolution images as well as discussion on how those elements determine the final captured image. The students learned that photography is not just a “point and shoot” process. The students worked on many exercises that apply to every aspect of photography in and out of the lab. This allowed the students not only to understand the complete functionality of their own camera, but to also be creative in thought process.

The following concepts were taught, discussed, and applied in assignments, both in and out of the classroom during the week:

- Camera History
- Camera Modes
- Types of camera lenses
- Digital v Film
- Types of digital sensors
- Types of memory cards
- Digital file types
- Digital image quality & size
- Camera laws
- Camera Nomenclature
- Field of view v Angle of view
- Focusing and Metering Modes
- White Balance
- Exposure and bracketing
- Exposure Compensation
- Histogram
- Shutter Speed
- Capturing moving objects
- ISO (film speed)
- Aperture
- Depth of Field Exercise
- Types of lighting
- Macro/Close-up Exercises
- Painting with Light
- Filling the Frame
- Perspective
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WEEK 2 - BASIC LATENT PRINT PROCESSING METHODS
This course was designed to teach the participant the fundamentals of basic latent print development techniques through practical exercises, lectures, and discussions.  An understanding of inherent florescence, cyanoacrylate fuming, RUVIS, and powder processing techniques were included as well as laboratory safety, handling of evidence, and hands on workshops that teach the student what really works in the field. Students had the opportunity to work in groups processing items that they will encounter quite often in their career and learning what to do and what not to do to successfully develop the prints that will help them catch the bad guy.
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WEEK 1 - INTRODUCTION TO THE SCIENCE OF FRICTION RIDGE EXAMINATION
Week 1 was all about gaining the knowledge of how to evaluate, compare, and identify friction ridge skin. This was accomplished through many hours of training that involved independent study and one-on-one mentoring from an expert RS&A instructor. Throughout week 1, students were constantly challenged through a series of lectures, practical exercises, and drills that have been specifically designed to increase a student's knowledge and to foster their confidence in the usefulness of the science, and their ability to use it. Many different facets of friction skin examination were explored and the challenges associated with the science were discussed in detail. Each student now has a clear understanding of the principles underlying the science and as a result, they now have a practical, functional knowledge of how to examine friction skin. Each student was taught the "language" of friction skin examination and pattern recognition. Then each student learned how to use all three "levels of detail" and apply ACE-V methodology as the basis for the examination process.
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© 2002, Ron Smith & Associates, Inc.