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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 l.jpg

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 l.jpg

Evidence

People

Q: 17


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Evidence

People &

Things


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What is Evidence?

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


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What is Evidence?

  • Items found at the scene of the crime or on the victim


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What is Evidence?

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

Q: 3, 14


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What is a Criminalist?

A person trained to:

  • Collect Evidence

  • Make Scientific Tests


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What is a Criminalist?

A person trained to:

  • Assess various types of physical evidence


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What is a Criminalist?

A person trained to:

  • Assess various types of physical evidence


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What is a Criminalist?

A person trained to:

  • Assess various types of physical evidence


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Crime Scene Techniques

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

.


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Crime Scene Techniques

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

.


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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


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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


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Photographing theCrime Scene

A visual record of the original conditions at the crime scene

Q: 21


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Photographing theCrime Scene

Forms an organized sequence of all locations and objects


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Photographing the Crime Scene

Photos should be taken at

  • Long Range

  • Mid Range

  • Short Range

Q: 12


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Long Range Photos

Broad and General


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Mid Range Photos

Portion of the scene. Attention to some objects


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Close-Up Photos

Specific area on an object or victim


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Videotaping the Scene

Not to be used to replace still photos


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Videotaping the Scene

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

Q: 18


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Videotaping the Scene

Include long-range, mid range and close ups


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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


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Sketching the Crime Scene

An important tool in

investigations


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Sketching the Crime Scene

An important tool in

investigations








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How Are Sketches Prepared?

Simple line drawings

Accurate and consistent scale

Q: 11, 24


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How Are Sketches Prepared?

All measurements must be accurate


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How Are Sketches Prepared?

Use graph paper to improve accuracy of scale


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How Are Sketches Prepared?

Use standard symbols to designate objects



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SketchingMethods

Rectangular

Triangulation


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SketchingMethods

Rectangular

Triangulation

Cross-Projection

Base-Line

Compass


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Sketching Methods

Rectangular

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

a


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Sketching Methods

Rectangular

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

a


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Sketching Methods

Rectangular

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

a

Graphic


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Sketching Methods

Triangulation

a

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


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Sketching Methods

Triangulation

a

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


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Sketching Methods

Triangulation

a

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

Graphic

Q: 9


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Sketching Methods

Base-Line

A single reference line established by string or chalk

a


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Sketching Methods

Base-Line

A single reference line established by string or chalk

a


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Sketching Methods

Base-Line

A single reference line established by string or chalk

a


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Sketching Methods

Base-Line

A single reference line established by string or chalk

a


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Sketching Methods

Base-Line

A single reference line established by string or chalk

a


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Sketching Methods

Base-Line

A single reference line established by string or chalk

a


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Sketching Methods

Base-Line

A single reference line established by string or chalk

a


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Sketching Methods

Base-Line

A single reference line established by string or chalk

a

Graphic


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Sketching Methods

Compass Point

Measures angles between two lines


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Sketching Methods

Compass Point

One point is selected as the origin


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Sketching Methods

Compass Point

A line extending from the origin becomes an axis


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Sketching Methods

Compass Point

From which angles can be measured

135

Graphic


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Sketching Methods

Cross Projection

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


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Sketching Methods

Cross Projection

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


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Sketching Methods

Cross Projection

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


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Sketching Methods

Cross Projection

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


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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


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Pencils

Graph or plain paper

Clip board

Equipment for Sketches


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Tape measure, rulers

Compass

Protractor

Equipment for Sketches


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Equipment for Searches

Evidence gathering kit-portable

Evidence Kit


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Latex gloves

Camera , film

Rope

Evidence Tags

Containers

Envelopes

Equipment Check List

Q: 8


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Magnifier

Test Tubes, Bottles

Axe, Saw, Pry Bar

First Aid Kit

Equipment Check List


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Chalk, chalk line

Compass

Fingerprint Kit

String, Knife

Equipment Check List


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Paper, Pencils

Pens, Indelible Markers

Plastic & Paper Bags

Cellophane Tape

Equipment Check List


Equipment check list80 l.jpg

Flashlight, batteries

Probing Rod, Wire

Metal Detector

Equipment Check List


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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


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Search Patterns

Spiral Search Pattern

  • Used outdoors

  • Used by a single person


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Search Patterns

Spiral Search Pattern

Begins in outer corner, walks in spiral to center

Q: 6, 20

Graphic


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Search Patterns

Strip Search Pattern

Pattern in which area is divided into a series of lanes


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Search Patterns

Strip Search Pattern

One or two search up and down until completed


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Search Patterns

Strip Search Pattern

One or two search up and down until completed


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Search Patterns

Strip Search Pattern

One or two search up and down until completed


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Search Patterns

Strip Search Pattern

One or two search up and down until completed

Graphic

Q: 7


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Search Patterns

Grid Search Pattern

Searched from two angles - first a strip search,


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Search Patterns

Grid Search Pattern

Searched from two angles - first a strip search,


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Search Patterns

Grid Search Pattern

Searched from two angles - first a strip search,


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Search Patterns

Grid Search Pattern

Searched from two angles - first a strip search,


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Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes


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Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes


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Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes


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Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes


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Search Patterns

Grid Search Pattern

Then a search at right angles to the original lanes

Graphic


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Search Patterns

Zone Search Pattern

Area is divided into four quadrants -


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Search Patterns

Zone Search Pattern

Area is divided into four quadrants -

A


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Search Patterns

Zone Search Pattern

Area is divided into four quadrants -

A

B


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Search Patterns

Zone Search Pattern

Area is divided into four quadrants -

A

B

C


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Search Patterns

Zone Search Pattern

Area is divided into four quadrants -

A

B

C

D


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Search Patterns

Zone Search Pattern

Each examined with one other pattern

A

B

C

D

Graphic


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Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6


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Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6


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Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6


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Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6


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Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6


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Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6


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Search Patterns

Pie or Wheel Pattern

Area is divided into pie-shaped sections, usually 6


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Search Patterns

Pie or Wheel Pattern

Each section is searched in a strip pattern

Graphic

Q: 23


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When it comes to evidence….

Courts want to know...

  • Who found it?

  • What did it look like?

  • When was it found?

Q: 22


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When it comes to evidence….

Courts want to know...

  • Where was it found?

  • What is its relation to other evidence?


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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


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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




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The Scene

Rival gang members

Bowling alley parking lot


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The Scene

Three men dead


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The Scene

Three men dead

Two cars destroyed


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The Scene

Three men dead

Two cars destroyed


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The Scene

Several onlookers walking through crime scene

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


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You and your partner are the first officers at the scene

What would be your first action?

What would be your second response?


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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?


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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



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Armed Robbery at Convenience Store

Shots fired

No one injured

6-10




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

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


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

What method would you use to search the crime scene?


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

How would you record the crime scene?


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

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


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