1. NO BELLWORK! Bell Work: 11/19/14
IMMEDIATELY begin on your rectangular coordinates crime scene sketches!

2. EQ & Objectives
Objectives EQ
TLW:
Use deductive reasoning to solve a crime.
Create a model/method for collecting evidence at a crime scene.
Learn how do document evidence from a crime scene.
Can we research areas of health sciences—forensic science?

3. Documenting Evidence From a Crime Scene: Rectangular Coordinates
Include the dimensions of the room or area drawn
Include distances between objects shown
Include dimensions of large pieces of furniture
Indicate location of all fixed objects:
Doors
Windows
Shelves
Partitions
Indicate, with numbers, the location of all moveable objects and any object to be removed from the scene:
Lamps
Statues
Large pictures
Pieces of furniture
Create a legend on the sketch
Include true north on the sketch. Anybody have a compass?
½” (2 blocks) = 1’

4. ANSWER ALL QUESTIONS ON YOUR BELL WORK SHEET!!!
Complete the Crime and Puzzlement activity “Check It”.
ANSWER ALL QUESTIONS ON YOUR BELL WORK SHEET!!!
After all team members have completed the activity on their own, get with your team and compare information.

5. EQ & Objectives
Objectives EQ
TLW:
Identify different fingerprint classes.
Identify the unique ridge patterns of a fingerprint.
Develop latent prints from a crime scene and identify the fingerprint patterns.
Can we research areas of health sciences—forensic science?

6. Mock Crime Scene
Patent prints- impressions obvious to the human eye and which have been caused by the transfer of material from a finger onto a surface (ex. Ink).
Where might we find fingerprints, latent or patent, in our mock crime scene?

7. Fingerprint Principles
According to criminal investigators, fingerprints follow 3 fundamental principles:
A fingerprint is an individual characteristic; no two people have been found with the exact same fingerprint pattern.
A fingerprint pattern will remain unchanged for the life of an individual; however, the print itself may change due to permanent scars and skin diseases.
Fingerprints have general characteristic ridge patterns that allow them to be systematically identified.

8. Fingerprint Classes
There are 3 specific classes for all fingerprints based
upon their visual pattern: arches, loops, and whorls.
Each group is divided into smaller groups as seen in the lists below.
Arch
Plain arch
Tented arch
Loop
Radial Loop
Ulnar loop
Whorl
Plain whorl
Central pocket whorl
Double loop whorl
Accidental whorl
60% of people have loops
35% have whorls
5% have arches

9. Arches
Arches are the simplest type of fingerprints that are formed by ridges that enter on one side of the print and exit on the other. No deltas are present.
Tented Arches
Similar to the plain arch,
but has a spike in the center.
Spike or “tent”
Plain Arch
Ridges enter on one side and
exit on the other side.

10. Loops
Radius
Ulna
Left Hand
Loops must have one delta and one or more ridges that enter and leave on the same side. These patterns are named for their positions related to the radius and ulna bones, i.e. the bone the loop opening is facing towards.
L – Radial Loop
R - Ulnar Loop
L – Ulnar Loop
R - Radial Loop
Delta
X-Ray Imagine:

12. Whorls
Whorls have at least one ridge that makes (or tends to make) a complete circuit. They also have at least two deltas. If a print has more than two deltas, it is most likely an accidental.
Central Pocket Whorl
Plain Whorl
Draw a line between the two deltas in the plain and central pocket whorls. If some of the curved ridges touch the line, it is a plain whorl. If none of the center core touches the line, it is a central pocket whorl.

13. Whorls – Part 2 Double Loop Whorl
Double loop whorls are made up of any two loops combined into one print.
Delta
Accidental Whorl
Accidental whorls contain two or more patterns (not including the plain arch), or does not clearly fall under any of the other categories.

14. Identify each fingerprint pattern.? A B
Right Hand
Left Hand
Answer Key: A - Plain Whorl, B – Double Loop Whorl, C – Radial Loop, D – Tented Arch, E – Plain Arch C
Right Hand E D
Right Hand
Left Hand

15. It’s time to make some prints!
Avoid Partial Prints
GOOD PRINT Get as much of the top part of your finger as possible!

16. Directions
1st – Roll the “pad” portion of your thumb over the ink pad from the left side of your thumb to the right. You do not have to push down really hard!
2nd – Roll the “pad” portion of your thumb from the left side of your thumb to the right in the correct box on your paper to make a thumbprint.
3rd – Continue this process to make a fingerprint of all ten fingers on the “My Prints” worksheet.
4th –Use your notes and a magnifying lens to help you figure out what type of pattern is found in each of your fingerprints. Label each one with the pattern’s name.

17. How do our fingerprint patterns compare to the expected averages?
Fingerprint Analysis
How do our fingerprint patterns compare to the expected averages?

18. How do our results compare to the averages?
Let’s determine the rate of occurrence for our fingerprint patterns ...
Pattern #
Total Prints %
Arch
Loop
Whorl
How do our results compare to the averages?
60% - Loops % - Whorls % - Arches
__% - Loops __% - Whorls __% - Arches
Write a paragraph on your worksheet that summarizes our results.

19. Let’s determine the rate of occurrence to compare males vs. females.
Pattern
# Male
# Female
Total
Prints %
Arch
Loop
Whorl
Which pattern is most common pattern among the males in this class?
Which is most common pattern among the females?

20. Tweet a response…
Use a Post-It Note to “tweet” about the following question:
How do the averages of fingerprint patterns for each gender compare to the expected averages?