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Forensic Science

Crime Scene Basics

Any physical location where a crime has occurred Crime Scene
Person Committing the crime Suspect
Person associated with someone committing the crime Accomplice
Statement of where the person was at the time of the crime Alibi
Original location of the crime Primary crime scene
Oral or written statments Testimonial
material items that would be present at the Material items found at the crime scene, on the victims, found in a suspect’s possession Physical evidence
Physical evidence that is found in small but measurable amounts, such as strands of hair, fibers, or skin cells Trace evidence
First to arrive at a crime scene Police Officer
Documents the crime scene in detail CSI Unit
Determines if any search warrants are required District Attorny
Determines a preliminary cause of death Medical Examiner
If evidence requires expert analysis Specialist
Interviews witnesses and consults with CSI Unit Detectives
First step of crime scene protocol Interview
Determine the presence of a controlled substance Drug Chemistry
Identification and comparison of materials from fires, explosions, paints, and glass Trace Chemistry
Microscopic identification and comparison of evidence, such as hairs, fibers, woods, soils, building materials, insulation and other materials Microscpy
Analysis of body fluids and dried stains such as blood, semen, and saliva Biolgy/DNA
Tests body fluids and tissues to determine the presence of drugs and poisons Toxicology
Identification and comparison of fingerprints or other hidden impressions from sources like feet, shoes, ears, lips or the tread on vehicle tires Latent Prints
Study of bullets and ammunition through the comparison of fired bullets, cartridges, guns, and gunpowder patterns on people and objects Ballistics
Examines marks left by tools on objects at a crime scene or on a victim, such as a hammer used to break a door or a screwdriver used to pick a lock Toolmarks
Examination of documents to compare handwriting, ink, paper, writing instruments, printers, and other characteristics that would help to identify its origin Questioned Documents
The second step in the investigation of a crime scene, which will help identify possible evidence, identify the point of entry and point of exit, and outline the general layout of the crime scene Examine
The third step in the protocol involves creating a pictorial record of the scene as well as a rough sketch to demonstrate the layout of the crime scene and to identify the exact position of the deceased victim or other evidence within the crime scene Document
This is the last step in the protocol. The crime scene technician will process the crime scene for evidence, both physical and testimonial evidence Process
Created by: mpringle