Download - Chapter 2- Crime Scene Investigation and Evidence Collection (modern marvel- FBI crime lab)
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Chapter 2- Crime Scene Investigation and Evidence Collection(modern marvel- FBI crime lab)
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Types of Evidence
Direct:– 1st hand observations that may/may not prove
an alleged act
Circumstantial:– Indirect evidence , used to imply a fact but not
prove it directly, can be physical or biological
Trace Evidence:– Small but measurable quantities of physical or
biological material found at scene
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Locard Exchange Principle: when a person comes into contact with an object or another person, a cross-transfer of trace evidence can occur
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Common Forms of Physical Evidence
(Note: the weight of physical evidence is left up to the jury)
1. Blood, semen, saliva
2. Documents
3. Drugs
4. Explosives
5. Fibers
6. Fingerprints
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7. Firearms and ammunition/ powder residue
8. Glass
9. Hair
10. Impressions (bite/tire/shoe)
11. Organs and physiological fluids
12. Paint
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13. Petroleum Products
14. Plastic bags/polymers
15. Serial Numbers
16. Soil
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Purpose of Evidence
1. Identification– Determine a substance’s physical or
chemical identity– Determine what species it came from
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2. Comparison Compare evidence to other objects to see if
they have the same origin Each evidence type has a specific # of
properties that must match
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Types of Characteristics
1. Individual Characteristics Properties of the evidence that can be
attributed to a source w/ high degree of certainty
Ex. Ridges on fingerprints, striations on bullets, wear patterns on shoes/tires
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Types of Characteristics
2. Class Characteristics Occurs when evidence is associated w/ a
group, not a single source Chance of finding class evidence is greater Use class evidence to corroborate events Ex. Type of fiber, type of soil
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Steps of Evidence Collection
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1. Secure and Isolate the Crime SceneEnsure no destruction of evidenceObtain medical assistance (if needed)(every individual who enters the scene
is a potential destroyer of evidence)Separate any witnesses and questionSet up primary and secondary crime
scenes
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2. Record the Scene*Photography
Done before any other workPhotograph before anything is
removedPhotograph all areas of scene and
surroundingsUse frame of reference in picture
(ruler, coin)
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*Sketches
CSI does rough sketchGives dimensions, shows location of all
important objects (with legend below sketch)
Measure distance from fixed pointsShows northFinish sketch-CAD design (for court,
precise)
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*Notes
Detailed written description of scene
Includes who discovered pieces of evidence, time, how it was collected
Can be tape recorded
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3. Conduct a systematic search for evidence
Done by CSI or field evidence technician
Examine for fingerprints, foot prints, tool marks, hair, fibers, etc.
How one proceeds depends on the size of the scene
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4.Collect and package physical evidence
Evidence must be handled and processed in a way that prevents any change from taking place (ex. Arson- air tight container)
Assure no:contamination, breakage, evaporation, scratching, bending
All items are packaged separatelyTools used: forceps, pill bottles, glass vial,
manila envelopes
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5. Maintain the chain of custody
Keep a list of all persons who come into possession of an item of evidence (this is presented in court) and witnesses to the collection
Includes: case number, description, name of suspect/victim and date/time of collection
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6. Obtain controls
Obtain physical evidence of known objects
Used as a standard for comparison or elimination of suspects
Ex. Blood/hair from suspect and victim
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7. Submit evidence to laboratory
Bring to crime lab personally or mailMust include a “request for
examination” (so the crime lab knows what to look for- don’t want them doing drug analysis on something you wanted them to test for DNA on)
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8. Analysis of evidence
Four Federal Crime Labs– Federal Bureau of Investigation (FBI)– Drug Enforcement Agency (DEA)– Bureau of Alcohol, Tobacco, and Firearms
(ATF)– United States Postal Inspection Service
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8. Analysis of evidence
Basic Services Provided:– Physical Science Unit
– Biology unit
– Firearms Unit
– Document Examination
– Photography Unit
Other Services:– Toxicology Unit
– Latent Fingerprint Unit
– Polygraph Unit
– Voiceprint Analysis Unit
– Evidence Collection Unit
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Legal Considerations at the Crime Scene
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Fourth Amendment Privilege
Right of people from “unreasonable search and seizure”
Warrantless search allowed if:1. Existence of emergency2. It is needed to prevent loss/destruction of evidence3. Search of person/property w/in immediate control
of person in lawful arrest4. Search made by consent of parties involved
5. Newtown warrants Adam Lansa
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2. Mincey v. Arizona -1978
Legality of police raid of drug dealer-ended w/ cop killed
Police searched dealers house for 4 days with out warrant
Supreme court upheld 4th ammend.- even it was serious-evidence not admitted
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3. Michigan v. Tyler- 1978
Entry to a fire requires NO warrant
Site can be investigated for a reasonable time after fire (but additional re-entries need warrant)
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Guides to Collection of Evidence
NOTE: When time and circumstances permit, obtain a search warrant b/4 investigating and retrieving physical evidence from a crime scene
Collecting evidence
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On Saturday January 6, 2007 Hugh Christopher Newsom, age 23 and Channon Gail Christian, age 21, both students at the University of Tennessee went out on a date. They were driving in Channon's Toyota 4-Runner when they were carjacked at gunpoint. Suddenly the crime turned far more savage than an armed car theft. Chris and Channon were kidnapped and driven to 2316 Chipman Street where they were forced into the home at gunpoint. While Channon was forced to watch, her boyfriend was raped prison style and then his penis was cut off. He was later driven to nearby railroad tracks where he was shot and set afire. But Channon's hell was just beginning. She was beaten; gang raped repeatedly in many ways, had one of her breasts cut off and bleach poured down her throat to destroy DNA evidence-all while she was still alive. To add to Channon's degradation the suspects took turns urinating on her. They too set her body afire, apparently inside the residence, but for some reason left her body there-in five separate trash bags...
Walk through of Crime Scene newstory http://en.wikipedia.org/wiki/Murders_of_Channon_Christian_and_Christopher_Newsom
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Documenting a crime sceneCollecting evidenceTrace evidence- hair and fiber