searching the crime scene
TRANSCRIPT
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Searching the crime scene
A systematic approach
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Searching the scene
• The search for physical evidence must be thorough and systematic
• If the search is not done systematically, and in a timely manner, then charges of negligence or accusations of a cover up may be filed
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How to search
• How a crime scene is processed depends largely on the locale and size of the crime scene
• When possible, it is beneficial to have a person for supervising and overlooking of collection procedures
• Some general rules apply to all investigations such as searching for points of entry and exit first and foremost.
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How to search
• There are several different methods for collecting physical evidence
• Generally these are chosen based on experience and logic
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Spiral search method
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Spiral search method
• Generally used for large search areas with very few individuals involved in the search.
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Grid search method
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Grid search method
• Generally used for large search areas with numerous searchers.
• Often used in open fields and woodland areas
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Line search method
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Line search method
• Generally used in medium sized search areas with very few searchers.
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Quadrant search Method
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Quadrant search Method
• Used in small search areas where minute details are very important
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Collection of evidence• Evidence must be collected and handled in a way that
prevents any change from taking place between the time it is removed and the time it arrives at the lab.
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• Removal of any physical evidence, such as hairs, fibers, soil, etc., should not happen until the evidence is in the lab
• Each different item, or similar items collected at different locations, must placed in separate containers.
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Collecting tools
• The tools used in the collection process are as important as the collection itself. – Using the incorrect
tools can result in contamination
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• Collection tools also include the packaging devices.– In general manila
envelopes, pill bottles, and cardboard pill boxes are suitable
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Collecting blood evidence
• When collecting blood evidence what type of container should you use?
• If you use an airtight container then the condensation is conducive to mold growth and can ruin evidence.
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Collecting burned material
• Collection of burned material must be placed in an airtight container because of the possibility of losing volatile substances that could have been used in an arson case.
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Chain of Custody
• A written log of where evidence is and who may have it, must be kept at all times.
• Any break in the chain will result in the evidence being inadmissible in court