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Objective: SWBAT describe and lift and latent print

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Objective: SWBAT describe and lift and latent print Fingerprint sponge 3 (complete in your composition notebook and record the entry in your table of contents): – PowerPoint PPT presentation

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Title: Objective: SWBAT describe and lift and latent print


1
Objective SWBAT describe and lift and latent
print
  • Fingerprint sponge 3 (complete in your
    composition notebook and record the entry in your
    table of contents)
  • Write the daily objective
  • Draw an eye, an enclosure, and a fork minutiae

2
Table of Contents
10/16 Fingerprint Sponge 1
35ish Fingerprint notes part
1 35ish
Fingerprint exit ticket 1
37ish 10/18 Fingerprint Sponge 2
38ish Fingerprint notes
part 2 38ish 10/24
Fingerprint Sponge 3
40ish Fingerprint notes part 3
40ish
3
Homework
  • Chapter 6 Review Questions on Quia due Sunday
    10/28 by 1159 pm
  • Oct. 31 or Nov. 1 Science Fair Research papers
    are due

4
Agenda
  • Two Minute Mystery
  • Check 1 page summary from when sub was here
  • Check Science Fair Proposal Form and
    Background Research Plan Worksheet
  • Fingerprint notes part 3
  • Latent Fingerprint Lab
  • Exit Ticket

5
Latent Prints
  • Forensic Science

T. Trimpe 2007 http//sciencespot.net/
6
Types of Fingerprints
  • There are 3 types of prints that investigators
    look for at crime scenes
  • Patent fingerprints are visible prints
    transferred onto smooth surfaces by blood or
    other liquids.
  • Plastic fingerprints are indentations left in
    soft materials such as clay or wax.
  • Latent fingerprints are not visible but made so
    by dusting with powders or the use of chemicals.

7
Latent prints are impressions left by friction
ridge skin on a surface, such as a tool handle,
glass, door, etc.
Prints may be collected by revealing them with a
dusting of black powder and then lifted with a
piece of clear tape.
8
Some investigators use fluorescent powder and UV
lights to help them find latent prints on
multi-colored or dark surfaces.
Click the icon to view the Crime 360Super Glue
Video
Top Left http//www.stapletonandassociates.com/im
ages/MagPowder.jpg Bottom Left
http//www.ok.gov/osbi/images/ninhydrin20print.jp
g
Bottom Right http//www.forensicsrus.com/images/S
upergluePrint.jpg
9
Fingerprint Forensic FAQs
  • Can fingerprints be erased?
  • No, if, for example, they are removed with
    chemicals, they will grow back.
  • Is fingerprint identification reliable?
  • Yes, but analysts can make mistakes.
  • Is fingerprint matching carried out by computers
    in a matter of seconds?
  • No, but the FBIs Integrated Automated
    Fingerprint Identification System (IAFIS or AFIS)
    can provide a match in 2 hours for the prints in
    its Master File.

10
The Future of Fingerprinting
  • New scanning technologies and digitally
    identifying patterns may eliminate analytical
    mistakes.
  • Trace elements of objects that have been touched
    are being studied to help with the identification
    of individuals.
  • To help with identification, other physical
    features such as eyes and facial patterns are
    also being studied.

11
Directions 1 - Cover your table with white
butcher paper or newspaper. You must dust
everything on the paper! 2 - Get a lifting kit
from your teacher that contains black powder,
brushes, and clear tape. 3 - Press the pad of
your right thumb on the plastic sheet. Place on
the paper covering your table. 4 Dip a brush
lightly into the container of black powder and
then tap off the extra on the lid. You only need
a very small amount of powder to dust the
print. 5 Hold the brush over the print and
rotate it between your thumb and fingers. Use
the brush to remove any extra powder. 6 - Use a
small piece of clear tape to lift the print and
place it in on your notecard and label it with
your name.
CAUTION The black powder will be messy and
isnt easy to clean up. Dont dust anything
without permission!
12
How to Dust for Fingerprints
  • http//www.youtube.com/watch?v4bBCHByhpF4
  • What you must have in your notebook
  • Lab title Studying Latent Fingerprints
  • Lab Objectives
  • Your notecard with your lifted print must be
    taped in the lab
  • You must write down what type of print it is
    (arch, whorl, loop)

13
Clean Up 1 Clean off the plexiglass sheets and
put them back in the kit with the brushes and
tape. 2 Have someone help you fold the paper
in half and tap it to return the extra black
powder to the container. 3 Put the black
powder in the box and have it checked in by your
teacher. 4 Get a towel and dry wash the
table especially the edges that werent covered
with paper. 5 Get a wet towel to wash off the
table and then wipe it with some dry towels.
Keep cleaning until all the black powder is off
the table!
14
Exit Ticket (please complete in your notebook)
  1. What type of print did you lift from the plastic
    sheet (arch, whorl, loop)?
  2. What are the three different types of
    fingerprints that can be left on a surface?
  3. Explain how fingerprints can potentially be
    altered or covered up.
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