Latent Print Analysis
CSI Unit Training Materials
T. Tomm 2007 Updated 2023 https://sciencespot.net/
T. Tomm Updated 2023
https://sciencespot.net
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The student digital slides for this unit are available atx8C6zd-W_p88LUaAtB0NWg5-op0up8/edit?usp=sharinghttps://docs.google.com/presentation/d/1sgfLJWqEcyW3X
IMPORTANT: Make a copy of the student notebook
before you assign it on your LMS. It is view-only and I am
not able to approve access for your students.
The FULL digital notebook (with all the slides for the digital
lessons and activities) is available at
.
It is set up for standard paper (8.5x11) in landscape mode
for easier printing when needed. Paper versions are
available for this unit on my Forensic Science page athttps://sciencespot.net/Pages/classforsci.htmlyuUxiEsSM2m4YOAtIlfmD4O4YsLdPI/edit?usp=sharinghttps://docs.google.com/presentation/d/14eIEiGacRXMsD
A DRAFT of the general outline of the digital lessons (with
corresponding slide #s for the student notebook) is
available at
. It is based on 44-minute class
periods with 7
th
& 8
th
grade students.9mA/edit?usp=sharinguHQPXDKOxmZXtU_gxy9dphEuyC1P4jzP-https://docs.google.com/document/d/15wxjmL-
Preview presentations before using with your classes as
many slides have animations and links you will need to
use.
I do Science Starters at the beginning of each class
period. A collection of starters for Forensics is available
on my lessons plans page at
.https://sciencespot.net/Pages/classforsci.html
Part A: Watch the video to answer these questions.
1 – How soon do fingerprints form in a fetus?
2 – True or False? Identical twins have identical fingerprints.
3 – What are the parts of a fingerprint?
4 – Why do we have fingerprints?
5- True or False? No two people have the same fingerprints.
6 – In which century were fingerprints first used as evidence?
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Used to match fingerprints to identify victims or suspects.
2.
LATENT PRINTS
are impressions left by friction ridge skin on a
surface, such as a tool handle, glass, door, etc.
AFIS Video
https://www.youtube.com/watch?v=qX6hFXHDmk4
4. How can latent prints be collected?
a)
BLACK
or
MAGNETIC
powder can be
used, which works better on shiny surfaces
or plastic containers.
b)
FLUORESCENT
powder and UV
lights can find latent prints on multi-
colored or dark surfaces.
c)
CYANOACRYLATE
fuming method (often called the
super glue method) is a procedure that is used to develop
latent fingerprints on a variety of objects.
LAB DIRECTIONS
Before we begin …
You need to clean up any spills immediately!
Dust everything
on the paper
!
Don’t dust anything without permission
!
Materials
Each
TABLE
needs a
LIFTING KIT
magnetic
black powder,
magnetic applicators, and clear tape.
Each
PERSON
needs a
CD
and
INDEX CARD
. Put your
NAME
on the card! You will turn it in at the end of class.
Goal - Lift at least 4 GOOD fingerprints.
(You will have more time on Monday to finish!)
DIRECTIONS:
Press the pad of your right thumb on a CD to make a print.
Place the CD on the paper.
Dip a brush
lightly
into the container of black powder and
tap off the
extra
. You only need a
very small amount
of powder on the brush to
dust the print.
Hold the brush over the print and
gently
swipe over the print you
want to process.
Use the brush to remove any extra powder.
Use a small piece of clear tape to lift the print and place it on your
card.
Goal - Lift at least 4 GOOD fingerprints.
(You will have more time during the next class period!)
TURN IN YOUR CARD to the bins by the periodic table!
Clean Up
1 – Remove as much of the black powder as you can from the paper
with your magnetic applicator and return it to the container.
2 – Put your materials back in the kit and place in the sanitizer.
3 – Fold the paper in half and leave your paper in the middle of the
table.
4 – Get a towel and “dry” wash the table – especially the edges that
weren’t covered with white paper.
5 – Wash your hands!
Complete Challenge A
Fingerprinting Day 2
Finish your fingerprint card –
need at least 4 good latent prints.
Complete Challenge A in your
HDSN.
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OPTIONAL
– These practice
activities have been included
in the digital slides and the
printable worksheet. You
may choose to complete
them as a whole-class
activity instead of individually.
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Latent Prints
Clean Up
1 – Remove as much of the black powder as you can from the
paper with your magnetic applicator and return it to the
container. Fold the paper in half and leave your paper in the
middle of the table.
2 – Put your materials back in the kit. Return to the front
counter.
3 –Clean the CD and slide along with your table - return all
material to the front counter.
4 - Wash your hands!
TURN IN YOUR CARD IF you are done. If not, finish your
analysis and then turn in.
We will discuss the answers for both challenges tomorrow.
Latent Prints
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Explore the comprehensive training materials for latent print analysis, covering topics such as fingerprint formation, identification methods, AFIS technology, collection techniques, and practical lab exercises. Gain insights into the importance of fingerprints, their unique features, and historical significance in forensic investigations. Enhance your knowledge in this critical aspect of crime scene investigation.
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Presentation Transcript
CSI Unit Training Materials Latent Print Latent Print Analysis Analysis T. Tomm Updated 2023 https://sciencespot.net T. Tomm 2007 Updated 2023 https://sciencespot.net/
Part A: Watch the video to answer these questions. 24 weeks 1 How soon do fingerprints form in a fetus? 2 True or False? Identical twins have identical fingerprints. 3 What are the parts of a fingerprint? Ridges lines Valleys spaces between them 4 Why do we have fingerprints? To grasp objects (also called friction ridges) 5- True or False? No two people have the same fingerprints. People may have the same patterns, but not the exact same ridge features in the exact same places. 6 In which century were fingerprints first used as evidence? 19th Century
2. LATENT PRINTS are impressions left by friction ridge skin on a surface, such as a tool handle, glass, door, etc. 3. What is AFIS? How is it used? AFIS = AUTOMATED FINGERPRINT IDENTIFICATION SYSTEM Used to match fingerprints to identify victims or suspects. AFIS Video
4. How can latent prints be collected? a) BLACK or MAGNETIC powder can be used, which works better on shiny surfaces or plastic containers. b) FLUORESCENT powder and UV lights can find latent prints on multi- colored or dark surfaces. c) CYANOACRYLATE fuming method (often called the super glue method) is a procedure that is used to develop latent fingerprints on a variety of objects. d) NINHYDRIN is a chemical that bonds with the amino acids in fingerprints and will produce a blue or purple color. It is used to lift prints from surfaces such as paper and cardboard.
LAB DIRECTIONS Before we begin You need to clean up any spills immediately! Dust everything on the paper! Don t dust anything without permission! Materials Each TABLE needs a LIFTING KIT magnetic black powder, magnetic applicators, and clear tape. Each PERSON needs a CD and INDEX CARD. Put your NAME on the card! You will turn it in at the end of class. Goal - Lift at least 4 GOOD fingerprints. (You will have more time on Monday to finish!)
DIRECTIONS: Press the pad of your right thumb on a CD to make a print. Place the CD on the paper. Dip a brush lightly into the container of black powder and tap off the extra. You only need a very small amount of powder on the brush to dust the print. Hold the brush over the print and gently swipe over the print you want to process. Use the brush to remove any extra powder. Use a small piece of clear tape to lift the print and place it on your card. Goal - Lift at least 4 GOOD fingerprints. (You will have more time during the next class period!)
TURN IN YOUR CARD to the bins by the periodic table! Clean Up 1 Remove as much of the black powder as you can from the paper with your magnetic applicator and return it to the container. 2 Put your materials back in the kit and place in the sanitizer. 3 Fold the paper in half and leave your paper in the middle of the table. 4 Get a towel and dry wash the table especially the edges that weren t covered with white paper. 5 Wash your hands! Complete Challenge A
Fingerprinting Day 2 Finish your fingerprint card need at least 4 good latent prints. Complete Challenge A in your HDSN. We will work on Part B today. Click to watch the video
Label the image on your notes. PRACTICE #1 Use the tools provided to inspect your latent prints. ? ? Identify the PATTERN (arch, loop, or whorl) and write it on the card next to the print. Use a highlighter (or light colored permanent marker) to mark RIDGE STRUCTURES you see and LABEL the ones you can identify. ? ? ? ? What pattern do you see? What ridge structures do you see?
PRACTICE #1 ANSWERS ? DOT(or Island) ? Ending Ridge ? Fork Short Ridge ? What pattern do you see? ? Loop ? What ridge structures do you see? Scar
B PRACTICE #2 A Pattern = Pattern = What letters can you find? Circle them. Which ridge structures can you find? Use circles to mark each one and label. Which are plain whorls? Use a star to show your answer. C Pattern =
? B PRACTICE #2 ANSWERS A Whorl Pattern = ? Whorl Pattern = Bridges ? What letters can you find? Circle them. ? Fork ? ? Which ridge structures can you find? Use circles to mark each one and label. ? ? Which are plain whorls? Use a star to show your answer. Specialty ? C Whorl Pattern =
What patterns did your table have in common? What ridge structures? Latent Prints Use the images to help you classify your patterns and ridge structures.
Clean Up 1 Remove as much of the black powder as you can from the paper with your magnetic applicator and return it to the container. Fold the paper in half and leave your paper in the middle of the table. Latent Prints 2 Put your materials back in the kit. Return to the front counter. 3 Clean the CD and slide along with your table - return all material to the front counter. 4 - Wash your hands! TURN IN YOUR CARD IF you are done. If not, finish your analysis and then turn in. We will discuss the answers for both challenges tomorrow.
Create an impression on a CD or slide, dip the magnetic wand into the powder, lightly brush back and forth over the print to reveal it. Put a piece of tape over the print and slowly lift it to lift the print. Tape on an index card. Do not brush too hard or you will destroy the print! Your team should have found that many people have the same pattern, such as a lot of people having loops (60%) more than the whorls (35%) and arches (5%). Some people may also have the same ridge structures, but they are not in the exact same locations, the exact same size, or the exact same distance from each other. This is why we say that no two prints are the same they can be the same pattern but differ in the ridge structures.
