crime scene investigation
DESCRIPTION
CSITRANSCRIPT
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Crime Scene Investigation CSI
By: Dr/ Marwa Magdy Demonstrator of forensic medicine & toxicology
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Expectations
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Objectives
• Vocabulary• principles of crime scene investigation• Stages of CSISecuring SearchingDocumentingCollecting & preserving trace evidence
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Crime scene: Any physical location in which a crime or accident has occurred suspected of having occurred.
Source: http://www3.sc.maricopa.edu/ajs/crime_scene_technician.htm
Physical evidence: any material items that would be present at the crime scene, on the victim, or found in a suspect’s possession.
Trace evidence: physical evidence present at the crime scene in small but measurable amounts.
Suspect: person thought to be capable of comitting a crime.
Vocabulary
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1) Time frame
2) Crime scene zone
3) Crime scene investigation team
4) Crime scene investigation equipment
5) Crime scene search patterns
Source: http://www3.sc.maricopa.edu/ajs/crime_scene_technician.htm
Principles of CSI
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Time frame• Arrival of the CSI team should be as soon as
possible since the crime was reported.
• Late arrival at the crime scene may result in loosing important evidence.
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Crime scene zone
• Boundaries of the crime scene → as far as signs of committing a crime are visible.
Boundaries are defined by the head of the CSI team.
• Assailant’s path of entry andexite.g: windows,doors.
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CSI Team
• Head of the crime scene investiagtion team “prosecutor” . النيابة وكيل
• Forensic pathologist الشرعى الطبيب• police officer (investigator)المحقق • Photographer الجنائى المصور• Latent prints expert البصمات خبير• Explosives expert المفرقعات خبير• Members of CSI team الجنائى البحث فريق أعضاء
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CSI equipments• equipment for securing and preserving the crime
scene• equipment for collecting and packaging of evidence
• equipment for recording the crime scene and evidence.
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Tools for evidence collection• Rubber gloves.• Strong flashlight.• Syringes & needles.• Forceps & scissors .• Hand lens.• Labels & containers.• Plastic vials & jars.• Paper bags.
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Searching the crime scene
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Stages of CSI
1. Securing the crime scene2. Searching the crime scene3. Documenting & photographing4. Collecting & preserving evidence
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Securing the scene• Defining boundaries of the crime scene
• Entry is prohibited
• Every person who enters the crime scene has the potential to destroy physical evidence.
• Ensuring security for the crime scene investigation team members
• CSI team should wear protective clothes.
CSI video 2.flv
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Searching the scene
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Crime scene search patterns
• Many distinctive methods of searching the
crime scene.
• For different types of crimes, different search
patterns are suggested.
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Searching the crime scene
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Documenting the scene
• 3 methods of crime-scene recording:
• Photography • Sketches • Notes
• Ideally all 3 should be used.
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Photography • At this stage touching or moving objects is
prohibitted
• Particularly cadavers SHOULD remain untouched
• Objects may be marked with numbers and photographed
• what ?Crime scene & adjacent areasEntry & exitCadaver , weapon & injuries
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Pictures can tell …
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sketches
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Collecting & preserving evidence
• Common types of trace evidenceBloodSemenSalivaFingerprintsHairsFibersExplosivesWeapons
Glass ImpressionsPaintPetroleum productsPlastic bagsPowder residueSoil and mineralsTool marksWood
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Why is trace evidence useful?
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Blood stain
Finding The Stains:
Reagents :“Luminol and fluorescein” can reveal blood that has been watered down to a ratio of 12000:1.
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Seminal stain
• Seminal stains on dark material often have a white glistening appearance.
• Preliminary test (Ultraviolet light): bluish white fluorescence.
• Confirmatory test (Microscopic detection of spermatozoa)
• DNA of assailant
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Saliva stains
• Could be detected anywhere on clothing,bites,enveloppe& cigarette bits.
• DNA of the assailant
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Hair Human or animal Race Origin Manner in which hair
was removed Drugs ingested DNA analysis
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Latent prints
• Types :FingerprintPalmSole LipEarFoottyre
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Latent prints
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