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Evidence & Investigation: An Introduction

Evidence & Investigation: An Introduction. Forensic Science. Criminals will always take with them a trace of something from the scene of the crime, and will always leave behind some trace of having been there. Trace evidence is used to figure out what happened at the scene of the crime.

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Evidence & Investigation: An Introduction

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  1. Evidence & Investigation: An Introduction

  2. Forensic Science • Criminals will always take with them a trace of something from the scene of the crime, and will always leave behind some trace of having been there. • Trace evidence is used to figure out what happened at the scene of the crime. • The job of forensic science investigators is to collect, preserve and analyze evidence found at the crime scene.

  3. Types of Evidence • Fingerprints • Footwear impressions and footprints • Tire tracks • Hairs and fibres • Plastic and paper • Soil • Tool marks • Shell casings • Biological fluids • Auto parts

  4. What will we be doing in this unit… • We will be studying fingerprints, footprints, fibres, handwriting, chromatography and tire tracks so that we can answer these three (3) questions by the end of the unit: • What is so special about a fingerprint? • What story do footprints tell? • What do hunters or investigators look for when looking for an animal or a suspect?

  5. Crime Scene Basics Evidence and Investigation

  6. Crime Scene Vocabulary CRIME SCENE: Any physical location in which a crime has occurred or is suspected of having occurred. PRIMARY CRIME SCENE: The original 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.

  7. Types of Evidence 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. What will evidence collected at a scene do for the investigation? • May prove that a crime has been committed • Establish key elements of a crime • Link a suspect with a crime scene or a victim • Establish the identity of a victim or suspect • Corroborate verbal witness testimony • Exonerate the innocent. • Give detectives leads to work with in the case

  8. What evidence would you collect? Mock Crime Scene: http://www.masss.gov

  9. Shoe Prints *size *shape *tread pattern *distinguishing characteristics *cuts and marks

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