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Chapter 3. Menu. Evidence and the Crime Scene. Photographing the Crime Scene. Sketching the Crime Scene. Search Patterns. Scenario : Gang War Crime Scene. Scenario : Armed Robbery at Convenience Store. Preserving the Crime Scene. Preserving the Crime Scene.

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slide3

Menu

Evidence and the Crime Scene

Photographing the Crime Scene

Sketching the Crime Scene

Search Patterns

Scenario:Gang War Crime Scene

Scenario: Armed Robbery at Convenience Store

evidence

Evidence

People

Q: 17

evidence11

Evidence

People &

Things

what is evidence

What is Evidence?

  • Any item which establishes the facts of a related criminal case
what is evidence13

What is Evidence?

  • Items found at the scene of the crime or on the victim
what is evidence14

What is Evidence?

  • Items found on the suspect or in the suspect’s environment

Q: 3, 14

what is a criminalist

What is a Criminalist?

A person trained to:

  • Collect Evidence
  • Make Scientific Tests
what is a criminalist16

What is a Criminalist?

A person trained to:

  • Assess various types of physical evidence
what is a criminalist17

What is a Criminalist?

A person trained to:

  • Assess various types of physical evidence
what is a criminalist18

What is a Criminalist?

A person trained to:

  • Assess various types of physical evidence
crime scene techniques

Crime Scene Techniques

Officers at scene must create an accurate and objective visual record before any items are moved or contaminated

.

crime scene techniques20

Crime Scene Techniques

Officers at scene must create an accurate and objective visual record before any items are moved or contaminated

.

crime scene techniques21

Crime Scene Techniques

Officers at scene must create an accurate and objective visual record before any items are moved or contaminated

.

Q: 1, 4, 15, 16

slide23

Menu

Evidence and the Crime Scene

Photographing the Crime Scene

Sketching the Crime Scene

Search Patterns

Scenario:Gang War Crime Scene

Scenario: Armed Robbery at Convenience Store

photographing the crime scene

Photographing theCrime Scene

A visual record of the original conditions at the crime scene

Q: 21

photographing the crime scene25

Photographing theCrime Scene

Forms an organized sequence of all locations and objects

photographing the crime scene26

Photographing the Crime Scene

Photos should be taken at

  • Long Range
  • Mid Range
  • Short Range

Q: 12

long range photos

Long Range Photos

Broad and General

mid range photos

Mid Range Photos

Portion of the scene. Attention to some objects

close up photos

Close-Up Photos

Specific area on an object or victim

videotaping the scene

Videotaping the Scene

Not to be used to replace still photos

videotaping the scene31

Videotaping the Scene

Produce a continuous recording of all events that occur at the scene

Q: 18

videotaping the scene32

Videotaping the Scene

Include long-range, mid range and close ups

slide34

Menu

Evidence and the Crime Scene

Photographing the Crime Scene

Sketching the Crime Scene

Search Patterns

Scenario:Gang War Crime Scene

Scenario: Armed Robbery at Convenience Store

sketching the crime scene
Sketching the Crime Scene

An important tool in

investigations

sketching the crime scene36
Sketching the Crime Scene

An important tool in

investigations

how are sketches prepared
How Are Sketches Prepared?

Simple line drawings

Accurate and consistent scale

Q: 11, 24

how are sketches prepared44
How Are Sketches Prepared?

All measurements must be accurate

how are sketches prepared45
How Are Sketches Prepared?

Use graph paper to improve accuracy of scale

how are sketches prepared46
How Are Sketches Prepared?

Use standard symbols to designate objects

slide48

SketchingMethods

Rectangular

Triangulation

slide49

SketchingMethods

Rectangular

Triangulation

Cross-Projection

Base-Line

Compass

slide50

Sketching Methods

Rectangular

Measures the distance of an object -from two fixed lines at right angles to each other

a

slide51

Sketching Methods

Rectangular

Measures the distance of an object -from two fixed lines at right angles to each other

a

slide52

Sketching Methods

Rectangular

Measures the distance of an object -from two fixed lines at right angles to each other

a

Graphic

slide53

Sketching Methods

Triangulation

a

Measure the distance of an object along a straight line from two widely separated fixed points

slide54

Sketching Methods

Triangulation

a

Measure the distance of an object along a straight line from two widely separated fixed points

slide55

Sketching Methods

Triangulation

a

Measure the distance of an object along a straight line from two widely departed fixed points

Graphic

Q: 9

slide56

Sketching Methods

Base-Line

A single reference line established by string or chalk

a

slide57

Sketching Methods

Base-Line

A single reference line established by string or chalk

a

slide58

Sketching Methods

Base-Line

A single reference line established by string or chalk

a

slide59

Sketching Methods

Base-Line

A single reference line established by string or chalk

a

slide60

Sketching Methods

Base-Line

A single reference line established by string or chalk

a

slide61

Sketching Methods

Base-Line

A single reference line established by string or chalk

a

slide62

Sketching Methods

Base-Line

A single reference line established by string or chalk

a

slide63

Sketching Methods

Base-Line

A single reference line established by string or chalk

a

Graphic

slide64

Sketching Methods

Compass Point

Measures angles between two lines

slide65

Sketching Methods

Compass Point

One point is selected as the origin

slide66

Sketching Methods

Compass Point

A line extending from the origin becomes an axis

slide67

Sketching Methods

Compass Point

From which angles can be measured

135

Graphic

slide68

Sketching Methods

Cross Projection

Ceiling opens up like the lid of a box, four walls open out, measure from point on floor to wall

slide69

Sketching Methods

Cross Projection

Ceiling opens up like the lid of a box, four walls open out, measure from point on floor to wall

slide70

Sketching Methods

Cross Projection

Ceiling opens up like the lid of a box, four walls open out, measure from point on floor to wall

slide71

Sketching Methods

Cross Projection

Ceiling opens up like the lid of a box, four walls open out, measure from point on floor to wall

slide72

Sketching Methods

Cross Projection

Ceiling opens up like the lid of a box, four walls open out, measure from point on floor to wall

Graphic

equipment for sketches
Pencils

Graph or plain paper

Clip board

Equipment for Sketches
equipment for searches
Equipment for Searches

Evidence gathering kit-portable

Evidence Kit

equipment check list
Latex gloves

Camera , film

Rope

Evidence Tags

Containers

Envelopes

Equipment Check List

Q: 8

equipment check list77
Magnifier

Test Tubes, Bottles

Axe, Saw, Pry Bar

First Aid Kit

Equipment Check List
equipment check list78
Chalk, chalk line

Compass

Fingerprint Kit

String, Knife

Equipment Check List
equipment check list79
Paper, Pencils

Pens, Indelible Markers

Plastic & Paper Bags

Cellophane Tape

Equipment Check List
equipment check list80
Flashlight, batteries

Probing Rod, Wire

Metal Detector

Equipment Check List
slide82

Menu

Evidence and the Crime Scene

Photographing the Crime Scene

Sketching the Crime Scene

Search Patterns

Scenario:Gang War Crime Scene

Scenario: Armed Robbery at Convenience Store

slide83

Search Patterns

Spiral Search Pattern

  • Used outdoors
  • Used by a single person
slide84

Search Patterns

Spiral Search Pattern

Begins in outer corner, walks in spiral to center

Q: 6, 20

Graphic

slide85

Search Patterns

Strip Search Pattern

Pattern in which area is divided into a series of lanes

slide86

Search Patterns

Strip Search Pattern

One or two search up and down until completed

slide87

Search Patterns

Strip Search Pattern

One or two search up and down until completed

slide88

Search Patterns

Strip Search Pattern

One or two search up and down until completed

slide89

Search Patterns

Strip Search Pattern

One or two search up and down until completed

Graphic

Q: 7

slide90

Search Patterns

Grid Search Pattern

Searched from two angles - first a strip search,

slide91

Search Patterns

Grid Search Pattern

Searched from two angles - first a strip search,

slide92

Search Patterns

Grid Search Pattern

Searched from two angles - first a strip search,

slide93

Search Patterns

Grid Search Pattern

Searched from two angles - first a strip search,

slide94

Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes

slide95

Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes

slide96

Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes

slide97

Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes

slide98

Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes

Graphic

slide99

Search Patterns

Zone Search Pattern

Area is divided into four quadrants -

slide100

Search Patterns

Zone Search Pattern

Area is divided into four quadrants -

A

slide101

Search Patterns

Zone Search Pattern

Area is divided into four quadrants -

A

B

slide102

Search Patterns

Zone Search Pattern

Area is divided into four quadrants -

A

B

C

slide103

Search Patterns

Zone Search Pattern

Area is divided into four quadrants -

A

B

C

D

slide104

Search Patterns

Zone Search Pattern

Each examined with one other pattern

A

B

C

D

Graphic

slide105

Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6

slide106

Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6

slide107

Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6

slide108

Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6

slide109

Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6

slide110

Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6

slide111

Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6

slide112

Search Patterns

Pie or Wheel Pattern

Each section is searched in a strip pattern

Graphic

Q: 23

slide113

When it comes to evidence….

Courts want to know...

  • Who found it?
  • What did it look like?
  • When was it found?

Q: 22

slide114

When it comes to evidence….

Courts want to know...

  • Where was it found?
  • What is its relation to other evidence?
slide115

When it comes to evidence….

Courts want to know...

  • Where was it held from the time of its collection to its presentation in court?

Q: 10

slide117

Menu

Evidence and the Crime Scene

Photographing the Crime Scene

Sketching the Crime Scene

Search Patterns

Scenario:Gang War Crime Scene

Scenario: Armed Robbery at Convenience Store

slide120

The Scene

Rival gang members

Bowling alley parking lot

slide121

The Scene

Three men dead

slide122

The Scene

Three men dead

Two cars destroyed

slide123

The Scene

Three men dead

Two cars destroyed

slide124

The Scene

Several onlookers walking through crime scene

Fire, police and emergency vehicles driving in an out of scene

slide125

You and your partner are the first officers at the scene

What would be your first action?

What would be your second response?

slide126

You and your partner are the first officers at the scene

Who would you interview?

How would you search the crime scene?

What search method would you use? Why?

slide128

Menu

Evidence and the Crime Scene

Photographing the Crime Scene

Sketching the Crime Scene

Search Patterns

Scenario:Gang War Crime Scene

Scenario: Armed Robbery at Convenience Store

slide130

Armed Robbery at Convenience Store

Shots fired

No one injured

6-10

slide133

You and two other officers have been sent to the crime scene.

What sort of evidence would you search for to reconstruct the crime?

slide134

You and two other officers have been sent to the crime scene.

What method would you use to search the crime scene?

slide135

You and two other officers have been sent to the crime scene.

How would you record the crime scene?

slide136

You and two other officers have been sent to the crime scene.

How would you handle the evidence if you had no gloves?