JS 112 Fingerprint Lab continued

1
JS 112 Fingerprint Lab (continued)

• Pre-class activities
• Announcements and Assignments
• Exams to be handed back next time
• Review questions for reports
• Learning objectives
• Ink and Classify your 10 prints
• Describe the proper procedure for preserving a
  developed latent fingerprint

2
Announcements and Assignments

• Announcements- Next week spring break
• Extra credit- Find an article from March 2009 in
  the news on the use forensic science to solve a
  crime. Write a 300 word summary and 3Q and 3 A.
  Bring a hard copy of the article as well as your
  summary 3Q and 3A to class on 30 March
• Bruce Wiley- The Real CSI 30 March
• Study for Exam II coming up on 6 April
• Assignments
• Read Fisher Chapters 9, 10 and 11
• Visit and Read the following Fingerprints and
  footwear forensics
• http//scienceandresearch.homeoffice.gov.uk/hosdb/
  fingerprints-footwear-marks/fingerprinting-methods
  /
• http//scienceandresearch.homeoffice.gov.uk/hosdb/
  fingerprints-footwear-marks/footwear-marks/
• http//scienceandresearch.homeoffice.gov.uk/hosdb/
  fingerprints-footwear-marks/using-iris-technology/
  
• http//scienceandresearch.homeoffice.gov.uk/hosdb/
  fingerprints-footwear-marks/fingerprint-publicatio
  ns

3
Announcements and Assignments

• Assignments
• Start to prepare student led reviews
• Chapter 6 ________________________________
• Chapter 9 ________________________________
• Chapter 10 ________________________________
• Chapter 11 ________________________________
• Readings from Home office (websites assigned)
  ________
• CSI Exercise on fingerprints and fingerprint
  development chemical chart
  ________

4
Questions for Fingerprint CSI Activity

• Inked fingerprint references
• Did our percentages match the known (65L, 35W
  and 5 A)?
• What are three reasons that they may not match?
• Design an experiment to test your explanation.
• Evidence activity
• Can you determine with certainty the individual
  that left the print?
• What are the criteria you used?
• Are there level 2, minutia characteristics that
  you can see (and document) which lead you to
  believe these are from a specific individual? IF
  so, document the minutia and label them using
  your notes from the lecture.
• If not, can you narrow down the individuals that
  may have left the prints?

5
Questions for CSI activity

• Did you protect the scene? How did you set up a
  barrier?
• Did you interview any witnesses? First responder?
• What did you find (evidence)? How many pieces of
  evidence were there? Who collected it?
• Did you adequately sketch the scene for
  reconstruction? What measurement method(s) did
  you use? Did you remember to document the tools?
  Do you have enough detail in your notes?
• Did you properly fill out the chain of custody?

6
Measurement Activity Questions

• Do all your measurements agree? Why or why not?
• Do all the measurements between groups agree?
  Why or why not?
• If no, what are 3 reasons which may cause the
  discrepancy?
• For one of the reasons, design an experiment to
  test your hypothesis.
• Is there enough documentation for you to
  reconstruct the location of the crime scene.
• Describe 3 ways in which you believe you could
  improve the precision of your measurements.
• Can these measurements be used in court? What
  information would you need to document?

7
Fingerprint Classification

• Whorl includes Central Pocket Loop and Double
  Loop
• Fingerprints by Mark Hawthorne
• http//books.google.com/books?id0HNAOTe3_DgCpgP
  A40lpgPA40dqisacentralpocketloopawhorl3
  Fsourceblotsu-2bDVoJTpsigkOxOVdhkMbEtKwc1ikr
  hNCboF3AhleneidNq9Sc-dKIHwsAP-ksE5saXoiboo
  k_resultresnum5ctresultPPA42,M1

8
Fingerprint Exercise- Part I

• Create fingerprint exemplars for each member of
  your team
• Using the ink pads and fingerprint cards, roll
  all your fingers on the appropriate sections of
  the cards.
• Be sure to fill out the information at the top.
• Classify each of your 10 fingers as Loop, Arch,
  Whorl or Accidental
• Today- Reclassify fingerprints using confirmed
  information and retally totals

9
All of these are Whorls
10
FINGERPRINT LAB

• PART TWO
• C. Your Inked or pencil Prints
• What fingerprint patterns ?
• Enlarged print (at least one characteristic)
• Super Glue- information only

• PART ONE TODAY
• A. Black Powder
• Demo
• Smooth overhead
• B. Magnetic Powder
• Practice on your own right index print
• 2 different surfaces
• Smooth glass slide
• Rough Foam coffee cup

11
E. Evidence Sample

• Each team has an evidence item
• Hidden from view, have one of your team members
  lay your latent print on the item
• Once you have the item ready with a print AND all
  of your reference fingerprint cards, raise your
  hand to switch with another team
• Each team will process the item for fingerprints
  Use magnetic powder development. Photograph
  before and after development.
• Examine the reference fingerprint cards to see if
  you can eliminate or include any member of the
  team that provided the evidence.
• Identify the class and individual characteristics
  that you utilized in your analysis

12
SOURCES

• Rich Reneau- Santa Clara Sheriffs Office-
  Fingerprint expert
• Criminalistics/ Chapter 14 / Saferstein
• http//www.fbi.gov/hq/lab/org/lpu.htm
• http//www.onin.com/fp/
• Kendall FG, Rehn BW. 1983. Rapid Method of Super
  Glue Fuming Application for the Development of
  Latent Fingerprints. Journal of Forensic Science.
  28(3) 777-780.
• Lewis, LA. et al. 2001. Processes involved in the
  development of latent fingerprints using the
  cyanoacrylate fuming method. Journal of Forensic
  Science. 46(2) 241-246
• California Dept. Justice/ Physical Evidence
  bulletin-PEB 16-17
• International Association of Identification
• (IAI)-gt http//www.theiai.org