Bell Work: 11/19/14

•NO BELLWORK!• IMMEDIATELY begin on your rectangular coordinates crime scene sketches!

EQ & Objectives

EQ•Can we research areas of health sciences—forensic science?

Objectives

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.

Documenting Evidence From a Crime Scene:

Rectangular CoordinatesInclude the dimensions Include the dimensions of the room or of the room or area drawnarea drawnInclude distances between Include distances between objects shownobjects shownInclude dimensions of Include dimensions of large pieces of large pieces of furniturefurnitureIndicate location of all fixed Indicate location of all fixed objects:objects:

• DoorsDoors• WindowsWindows• ShelvesShelves• PartitionsPartitions

Indicate, with numbers, the Indicate, with numbers, the location of all moveable location of all moveable objects and any object to be objects and any object to be removed from the scene:removed from the scene:

• LampsLamps• StatuesStatues• Large picturesLarge pictures• Pieces of furniturePieces of furniture• Create a legend on the sketchCreate a legend on the sketch• Include true north on the Include true north on the

sketch. Anybody have a compass?sketch. Anybody have a compass?

½” (2 blocks) = 1’

Bell Work: 11/20/14

• 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.

EQ & Objectives

EQ•Can we research areas of health sciences—forensic science?

Objectives

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.

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?

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.

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.

ArchPlain arch

Tented arch

LoopRadial LoopUlnar loop

WhorlPlain whorl

Central pocket whorlDouble loop whorlAccidental whorl60% of people have loops

35% have whorls5% have arches

ArchesArches 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.

Plain ArchRidges enter on one side and

exit on the other side.

Tented Arches Similar to the plain arch,

but has a spike in the center.

Spike or “tent”

LoopsLoops 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.

Delta

L – Radial LoopR - Ulnar Loop

L – Ulnar Loop R - Radial Loop

Radius

Ulna

Left Hand

X-Ray Imagine: http://www.tooloop.com/wp-content/uploads/2013/12/Radius-Ulna-X-Ray.jpg

WhorlsWhorls 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.

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.

Plain Whorl

Central Pocket Whorl

Whorls – Part 2

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.

Double Loop Whorl

Double loop whorls are made up of any two loops combined into one print.

Delta

Delta

Identify each fingerprint pattern.

Right Hand

Left Hand

Left Hand

Right Hand

Right Hand

It’s time to makesome prints!

Avoid Partial Prints

GOOD PRINTGet as much of the top part of your finger as possible!

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.

How do our fingerprint patterns compare to the

expected 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 35% - Whorls 5 % - Arches

__% - Loops __% - Whorls __% - ArchesWrite a paragraph on your worksheet that summarizes our results.

Let’s determine the rate of occurrence to compare males vs. females.

Pattern#

Male#

FemaleTotal

Prints%

Arch

Loop

Whorl

Which pattern is most common pattern among the males in this class?

Which is most common pattern among the females?

Use a Post-It Note to “tweet” Use a Post-It Note to “tweet” about the following question: about the following question:

How do the averages of fingerprint patterns for each gender compare to the expected averages?

Tweet a response…