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CRIME S
CENE
DOCUMENTATI
ON
AU
GU
ST
21
20
14
CRIME SCENE SEARCH PATTERNSInvestigators 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
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 PATTERNSThink 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 PATTERNSThink 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
How do you know?
CRIME SCENE SEARCH PATTERNSThink 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 PATTERNSThink 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
How do you know?
CRIME SCENE SEARCH PATTERNSThink 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 PATTERNSThink 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 NOTESInvestigators take detailed notes on all of the
following:Step-by-step description of every action taken by investigators.
Date, time, location, weather, environmental conditionsDescription of crimeLocation of evidence with reference to other fixed pointsNames of all people on the scene, including authorized personnel, witnesses, victims
Click icon to add picture
EXAMPL
E NOTE
1
What
types
of
info
do
you s
ee?
EXAMPLE N
OTE 2
What
types
of
info
do
you s
ee?
CRIME SCENE PHOTOSThe scene should be thoroughly photographed beforeevidence 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.
PHOTO
EXAMPL
E 1
WH
AT TYPE O
F PH
OTO
I S T
HI S
?
WH
AT OTH
ER PH
OTO
S
SHO
ULD
BE T
AKEN?
PHOTO
EXAMPL
E 2
WH
AT TYPE O
F PH
OTO
I S T
HI S
?
WH
AT ELSE W
OU
LD B
E
USEFU
L IN
TH
I S
PHO
TO?
CRIME SCENE VIDEOSCrime 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 SKETCHESRough sketches are done on the scene, and
finished sketches are completed later.
Crime scene sketches should be labeled with: A titleA legend with letters, etc., for key pieces of evidenceCompass directionWhether to scale, and if so, what scaleCase numberOffense type Location
DISCUSS WITH A PARTNER:HOW DO THESE DIFFER?
CRIME SCENE SKETCHESThere are 3 basic methods for taking
measurements:
1. Triangulation
2. Baseline
3. Polar Coordinates
CRIME SCENE SKETCHESThere 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 SKETCHESThere 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
Evidence
Fixed point YFixed
point X
CRIME SCENE SKETCHESThere are 3 basic methods for taking
measurements:
1. Triangulation
2. Baseline
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
Evidence Fixed
point Y
Fixed point X
CRIME SCENE SKETCHESThere 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
EvidenceWall X
48o NE
SKETCHES – WE DO & YOU DOWe 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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