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How Math Is Used At Crime Scenes

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by

Katie Winger

on 13 December 2012

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Transcript of How Math Is Used At Crime Scenes

F Purpose Math at a Crime Scene Our topic relates to the general purpose of the project because we are exploring how math is used in investigating a crime scene and determining possible suspects. Examples of Math Used Fingerprints
Measurements
Distances
Trajectories Fingerprint Types Fingerprinting Measure distance between grooves and look for patterns in the prints

Compare fingerprints found at crime scene to those of a potential suspect or to those they have on file

Fingerprint scanners Shoe Prints Measurements are taken of the length of the shoe prints, the depth, and how far apart the prints are
Usually the taller the person, the longer the feet and stride
The bigger the person, the deeper the shoe print By: Katie Winger and Kelsey McLaughlin Time Of Death Lie Detecting Measurement of the change in
pulse rate blood pressure and
breathing patterns

If a significant change, a person
may be lying during the interview Sketching/Measuring Crime Scene Before any part of a crime scene is
touched or moved, an investigator uses
graph paper to draw an outer perimeter
of the scene

Also includes objects throughout the
room or area Measurement of the victim's body
temperature and the the surrounding area

Longer the body remains in an area, the closer
to the environment's temperature it becomes

Provides an accurate time in which the crime occurred which can rule out suspects Example Different Types of Fingerprints History of Fingerprinting In a Loop pattern, the ridges will
flow in one side, recurve and then
loop around
Left or right
70% of people
have loop
pattern Different Types of Fingerprints A whorl pattern consists of a series of
concentric circles
25% of people have whorl pattern Different Types of Fingerprints In an arch pattern, ridges flow in one side and out
the opposite side

Only 5% of people
have arch pattern Sir Francis Galton was the first to think of
finger printing as being a form of
identification

The first fingerprinting bureau was opened in Argentina in 1892, the same year Sir Francis released his works on fingerprinting Ten Print System Sir Henry Edward created this system which was used until computers

Included the patterns of fingerprints we still use today such as loops, whorls, and arches SICAR 6 Distances Using data collected from a crime scene, investigators can plug data into equations and determine things like :
how far a suspect traveled to commit a crime
how far from the crime the suspect could have gotten since committing the crime
and more Example Police often analyze skid marks from cars using the below equation Equation:
V= D/K D: Length of Skid Marks
K: constant based on car and friction of the road
V: velocity in miles per hour Assume he constant for a Honda Civic on dry concrete is 0.04
V= D/K
V= 42/0.04
V= 1050
V= 32.2 MPH Police can determine how fast a car was going at the time of impact The path described by a projectile flying or an object moving under the action of given forces. Trajectories From bullet holes to blood splatters crime scene investigators use math the determine the trajectory of a falling object. Examples Firearms Analyze the bullet
Link bullet to specific firearm
Recreate the crime scene
analyze yaw of bullet or the way in which it varies from a straight line
examine wound profiles Blood Splatters Scientists can determine the height of the suspect based on the angle of the impact
wounds also give clues as to the amount of force that was needed to create the wound
blood splatters help with scene reconstruction
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