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The Crime Scene
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The location & surrounding
areas where a crime has been
committed
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Any & all objects that:
establish a crime link a crime to its victim link a crime to its
perpetrator
Must be recognized at scene & preserved!!
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PPSCRIPT
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Get medical help for those who need it
Arrest suspect
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Keep out all unauthorized people
Rope off, barricade, station guards
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The unaltered scene so don’t move a thing!!
Crime scene & adjacent areas From all angles & overviews
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Body position & location
Close-ups of evidence, injures, weapons
Place ruler by object for reference
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A. Rough Sketch
shows evidence & important features
use tape measure distances must be
measured from 2 fixed points (walls)
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B. Finished Sketch
very accurate & drawn to scale
drafting tools & computer programs used
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Systematic & thorough
Establish points of entry & exit
Victim’s body is also searched at autopsy
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Avoid contamination!!!
Keep in original condition
Bloodstains scrape off surface transfer to moist
swab cut out stain
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1. Victim’s clothing2. Fingernail scrapings3. Hair4. Blood (DNA)5. Vaginal, anal, & oral swabs (sex
crimes)6. Recovered bullets from body7. Hand swabs (gunshot residues)
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Sample of known origin (control)
Compare it to crime scene evidence
Ex: Paint from suspect’s car & paint found on victim
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1. Latex gloves (doubled) & shoe covers
2. Masks / goggles / face shield / coveralls
3. Biohazard bags & labels4. Contaminated equipment
disinfected with 10% bleach solution
5. No smoking, drinking, or eating
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Detailed written description of crime scene & evidence
Provide time & person who found evidence
Document everything you see!!!
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Label/Tag officer’s initials location it was
found time
Establish Chain of Custody
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A.K.A. Continuity of PossessionA list of every person the evidence
was passed on to Transfer of evidenceFailure to establish this may lead
to questioning of the authenticity and integrity of evidence.
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Evidence must be packaged separately
The following items are useful: forceps manila envelopes unbreakable containers/pill bottles with lids screw-cap glass vials
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Use airtight containers b/c they trap fumes
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Do not use airtight containers
Place in paper bags to dry
Transfer to crime lab in BIOHAZARD bags
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Send evidence to lab for analysis
Chain of Custody must be included Keep it short!
Hand delivery is best
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ProtectPhotograph
SearchCollect
RecordIdentify
Package
Transport
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Search and Seizure
Warrants
Mincey v. Arizona
Michigan v. Tyler
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Drug dealer undercover cop killed
4-day search at homicide scene
No warrant
Guilty verdict reversed
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Business fire search conducted morning after
3 other searches (4,7, & 25 days later)
No warrant
Guilty verdict reversed
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Protects against unreasonable searches & seizures
Warrants must be obtained when time & circumstance permit it
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It’s an emergency!
You’re being arrested!
You give your permission!
Evidence is in danger of destruction!