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How to Process A Crime Scene

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Jonathan Saffle

on 12 November 2013

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Transcript of How to Process A Crime Scene

How to Process A Crime Scene
Steps To Processing
A Crime Scene

1.Secure a Crime Scene
2.Eximine Scene

Examine the Crime Scene
Recording the Scene
Three methods in recording a crime scene:
Secure a Crime Scene
Approach Scene
Secure and Protect Scene
Discuss upcoming search (brief)
Make sure your team is prepared
medical assistance
anything your team might need
Establish HQ (in major cases)
do not move any objects until photos are taken. (unless injured individuals are involved)
If a moved item value is lost report it
do not reintroduce objects into the crime scene for photos
Photos must include entire scene and surrounding areas
everything within the crime scene must be photographed with intesnse detail.
Photographing Evidence and victims
Bodies should be photographed in orignal positions
Close ups of injuries and weapons
Photos should be taken after removal of the body
Photographing Physical Evedeince:
needs close ups
must be photoed with rulers
must have points of reference
must be photographed in extreme detail
Video is allowed but must follow same guide lines
Approach Scene
When you arrive on the scene be sure to check for the following things.
discarded eviedence
possible escape approach & escape routes
Secure and Protect Scene
Take control of the scene on arrival
Determine how much of the scene is still preserved
Make sure no one can enter or exit the scene without being documented.
Document and question all personal who entered the scene in its original condition.
Initiate Preliminary Survey
Organize how to examine the scene
Do a caustious walk-through
Slecet appropriate narrative technique
Organize tatics to deal with special problem areas
Aquire preliminary photographs
ID and protect phyical evedince
Make extensive notes of enviroment and surroundings
Evaluate Physical Evideince Possibilities
Based on survey determine what kind of evidence might be present
take care of degradable evidence first
Focus on obvious then go to detail
Evaluat wether or no the evidence has been tampered with
Prepare Narrative
Consider what should be there but is not
Represent scene in a "general to specifc" shceme
Consider situational factors
Organized Search Tactics
Rough Sketch:
needs to be a rough sketch of scene
must include accurate demmensions
must show location of all evedeince (even bodies)
Items are sketched by distance mesasurments from two fixed points
everything must be labled by number or letter
must include legend and compass
Final sketch is a neat professional version of the rough sketch
must include description of the scene
must have location where all phyical evidence was found
Show who collected evidence and how
Notes must still be taken even if you use a tape recorder or video
Transfer of evidence
any evidence collected should be initailed by the officer who found it
As evidence is transfered to be stored the names ALL of the officers that have had it in their position must be recorded
This helps support the reliablity of evidence in a courte case
Sited Work
Preserving Evidence
the collecting process will start with collecting the most fragile/easily lost evidence

how things are collected
arson evidence is usally collected in air-tight clean metal cans
most items of evidence will be collected in paper containers such as packets,envelopes or bags.
liquid items can be transported in non breakable leak proof containers
only large quantities of dry powder and stored in plastic bags
random facts
photographers should always take pictures especialy when the others are collecting evidence just incase they missed something

collecting evidence should always be
in a logical manner
moist or wet evidence can be collected in plastic containers and tranproted to a evidence recieving center only if stored in container for 2hrs or less
if in contaienr longer than 2hrs ecidence may get contaminated and usless
items that could cross contaminate eachothers shpould be packeged separatly
contamination of
evidence should be closed and secured to prevent the mixture of evidence due to transportation
each container should have the evidence collectors initial
also the date and time collected a
complete description of evidence
where it was found
the investigation agency 's name
an a file number

the value of evidence collecting
the value of evidence is important
he/she should spend time on collecting good evidence
ex:if there is fingerprints vs strands from a shirt you should get both but spend more to collecting the evidence for a more accurate investagtion
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