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CRIME SCENE SEARCH PATTERNS
Investigators often use geometric search patterns while
searching for evidence to ensure that no evidence is missed.
The type of search pattern depends on the scene.
CRIME SCENE SEARCH PATTERNS
CRIME SCENE SEARCH PATTERNS
Grid search patterns are very
effective, but very time
consuming
CRIME SCENE SEARCH PATTERNS
Rarely used
Doesn’t work well with
physical barriers.
Sometimes used when
only
investigator present.
CRIME SCENE SEARCH PATTERNS
Works well in large, outdoor areas.
Often involves volunteers.
CRIME SCENE SEARCH PATTERNS
Works well in buildings and with
warrants searches.
CRIME SCENE SEARCH PATTERNS
Think about the following, but DON’T say the answer out loud.
When I ask, show me the correct answer with your fingers.
Investigators believe a body may have been dumped in a large
field. What search pattern be used?
1) Spiral
2) Grid
3) Parallel
4) Zone
CRIME SCENE SEARCH PATTERNS
Think about the following, but DON’T say the answer out loud.
When I ask, show me the correct answer with your fingers.
Investigators believe a body may have been dumped in a large
field. What search pattern be used?
1) Spiral
2) Grid
3) Parallel
How do you know?
4) Zone
CRIME SCENE SEARCH PATTERNS
Think about the following, but DON’T say the answer out loud.
When I ask, show me the correct answer with your fingers.
A very high profile crime has been committed, and the police
has been given a lot of resources and manpower to solve it.
Which pattern is appropriate?
1) Spiral
2) Grid
3) Parallel
4) Zone
CRIME SCENE SEARCH PATTERNS
Think about the following, but DON’T say the answer out loud.
When I ask, show me the correct answer with your fingers.
A very high profile crime has been committed, and the police
has been given a lot of resources and manpower to solve it.
Which pattern is appropriate?
1) Spiral
2) Grid
How do you know?
3) Parallel
4) Zone
CRIME SCENE SEARCH PATTERNS
Think about the following, but DON’T say the answer out loud.
When I ask, show me the correct answer with your fingers.
Police have a warrant to search a suspect’s car. Which pattern
is appropriate?
1) Spiral
2) Grid
3) Parallel
4) Zone
CRIME SCENE SEARCH PATTERNS
Think about the following, but DON”T say the answer out loud.
When I ask, show me the correct answer with your fingers.
Police have a warrant to search a suspect’s car. Which pattern
is appropriate?
1) Spiral
2) Grid
3) Parallel
4) Zone
How do you know?
CRIME SCENE NOTES
Investigators take detailed notes on all of the following:
 Step-by-step description of every action taken by investigators.
 Date, time, location, weather, environmental conditions
 Description of crime
 Location of evidence with reference to other fixed points
 Names of all people on the scene, including authorized
personnel, witnesses, victims
CRIME SCENE PHOTOS
The scene should be thoroughly photographed before
evidence collection.
Types of photos:
• overall scene (exterior and interior)
• midrange photos
• close up
Use scales and placards with photos
Start with the
larger, exterior
scene, and
move interior
and towards
finer detail.
CRIME SCENE VIDEOS
Crime scenes should be videotaped starting outside
and moving in, all around the crime scene.
Important details (time, place, and objective
descriptions should be included,
Other narration should be avoided.
Should not include members of the investigative team.
Watch me!
CRIME SCENE SKETCHES
Rough sketches are done on the scene, and finished sketches
are completed later.
Crime scene sketches should be labeled with:
 A title
 A legend with letters, etc., for key pieces of evidence
 Compass direction
 Whether to scale, and if so, what scale
 Case number
 Offense type
 Location
DISCUSS WITH A PARTNER:
HOW DO THESE DIFFER?
CRIME SCENE SKETCHES
There are 3 basic methods for taking measurements:
1. Triangulation
2. Baseline
3. Polar Coordinates
CRIME SCENE SKETCHES
There are 3 basic methods for taking measurements:
1. Triangulation
2. Baseline
3. Polar Coordinates
In triangulation,
you measure the distance of
each piece of evidence from
2 fixed points
CRIME SCENE SKETCHES
There are 3 basic methods for taking measurements:
1. Triangulation
2. Baseline
3. Polar Coordinates
Evidence
In triangulation,
you measure the distance of
each piece of evidence from
2 fixed points
Fixed
point X
Fixed
point Y
CRIME SCENE SKETCHES
There are 3 basic methods for taking measurements:
1. Triangulation
2. Baseline
Evidence
3. Polar Coordinates
With baseline, you create a
line between two fixed points
and measure the distance of the
evidence from a right angle to the line
Fixed
point X
Fixed
point Y
CRIME SCENE SKETCHES
There are 3 basic methods for taking measurements:
1. Triangulation
2. Baseline
3. Polar Coordinates
With polar coordinates, you measure
the distance and compass direction
of evidence away from a wall
Wall X
48o NE
Evidence
SKETCHES – WE DO & YOU DO
We will make a rough, to-scale sketch of the room using graph
paper.
1) Be sure to leave room for a legend, title, etc.
2) Measure room and create scale
3) Place boundaries & fixed points on sketch
4) Use each method to sketch one piece of evidence
5) You Do – Use each method to add in 3 more pieces of evidence
6) You Do – Complete legend
HOMEWORK – ENJOY YOUR WEEKEND!
Closure How did
Exit Ticket – Be sure your LEGEND is complete and
turn in your sketch

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