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Crime Scene Basics

crime scene Any physical location in which a crime has occurred or is suspected of having occurred.
primary crime scene The originl location of a crime or accident.
secondary crime scene An alternate location where additional evidence may be found.
suspect Person thought to be capable of committing a crime.
accomplice Person associated with someone suspected of committing a crime.
alibi Statement of where a suspect was at the time of a crime.
testimonial evidence includes oral or written statements given to police as well as court testimony by people who witnessed an event
physical evidence refers to any material items that would be present at the crime scene, on the victims, or found in a suspect's possession
trace evidence refers to physical evidence that is found in small but measurable amounts, such as strands of hair, fibers, or skin cells
police officers Typically the first to arrive at a crime scene. They are responisible for securing the scene so no evidence is destroyed and detaining persons of interest in the crime.
CSI unit documents the crime scene in detail and collects any physical evidence.
district attorney is often present to help determine if any search warrants are required to proceed and obtains those warrants from a judge
medical examiner (if a homicide) may or may not be present to determine a preliminary cause of death
specialists (forensic entomologists, anthropologists, or psychologists) may be called in if the evidence requires expert analysis
detectives Interview witnesses and consult with the CSI unit. they investigate the crime by following leads provided by witnesses and physical evidence.
Crime Scene Protocal: Step 1 Interview
Crime Scene Protocal: Step 2 Examine
Crime Scene Protocal: Step 3 Document
Crime Scene Protocal: Step 4 Process
Drug Chemistry Determines the presence of controlled substances and the identification of marijuana
Trace Chemistry Identification and comparison of materials from fires, explosions, paints, and glass.
Microscopy Microscopic identification and comparison of evidence, such as hairs, fibers, woods, soils, building materials, insulation and other materials.
Biology/DNA Analysis of body fluids and dried stains such as blood, semen, and saliva.
Toxicology Tests body fluids and tissues to determine the presence of drugs and poisons.
Latent Prints Identification and comparison of fingerprints or other hidden impressions from sources like feet, shoes, ears, lips or the tread on vehicle tires.
Ballistics (Firearms) Study of bullets and ammunition through the comparison of fired bullets, cartridges, guns, and gunpowder patterns on people and objects.
Toolmarks 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.
Questioned Documents Examination of documents to compare handwriting, ink, paper, writing instruments, printers, and other characteristics that would help to identify its origin.
Created by: nmbartlett