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The Crime Scene.

Published byPhilip Hutchinson Modified over 7 years ago

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Presentation on theme: "The Crime Scene."— Presentation transcript:

1 The Crime Scene

2 Crime Scenes Tell A Story Through Physical Evidence
= any and all objects that can establish that a crime has been committed or can provide a link between a crime and its victim or a crime and its perpetrator

3 3

4 Crime Scene Don'ts No Eating No Drinking No Smoking 4

5 Crime Scene Processing
Establish Legality of Search 4th , 5th, 6th, 14th Amendment Protections Can search without warrant if: a. consent given b. life in danger c. immediate property of arrestee d. evidence in danger of destruction Secure/Isolate Scene Encounter Site Attack Site Crime Site Victim Dump Site Vehicle Disposal Site 3. Search Scene and Define its Borders 5

6 Search Patterns Spiral Line Grid Zone 6

7 What Search Type?

8 Buried Sites Follow Archeology Protocols
8

9 Levels of Search Phase 1 Examine scene with EYES ONLY
Mark potential evidence Photograph Draw Take Notes Measure distances of evidence from fixed points 9

10 Crime Scene Sketch 10

11 Crime Scene Processing
Phase 2 Collect and store evidence appropriately Also collect control samples Body Bag Paper bags Pill bottles Tweezers+Tools Empty Paint Cans Manila envelopes Swabs Vacuum 11

12 What type of evidence is left at scene?
Blood Paint Petroleum Products Plastic Bags Powder Residue Serial Numbers Soil and Minerals Tool Marks Wood and Vegetative Matter Semen Saliva Documents Drugs Explosives Fibers Prints Firearms and Ammunition Glass Hair Bodies/Parts Impressions

13 Good Evidence vs. Better Evidence
Class characteristic evidence Blood type Car paint Clothing fibers Individual characteristic evidence DNA Fingerprints

14 Crime Scene Processing
Large areas many be sawed out and transported Cars removed to lab garage

15 Crime Scene Search Phase 3 (most intrusive) Open drawers
Turn over items in scene Look in clothes Develop latent prints Spray Luminol Remove carpet and wall sections 15

16 Chain of Custody Validates authenticity, validity, integrity of evidence 16

17 Crime Scene Safety Infectious materials
Wear gloves, have biohazard bags, shoe covers, Kleengard suits and masks, disposable writing instruments

18 Crime Scene Safety Sharps
Be alert and once encountered they are packaged No eating, drinking, smoking or makeup application at scene.

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