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Forensic Science

Learn how detectives use logic to narrow down suspects and the rules of evidence, including probative value and material evidence. Understand what makes up physical evidence and the types of physical evidence. Differentiate between individual evidence and class evidence through a Venn diagram.

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Forensic Science

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Presentation Transcript

  1. Forensic Science Unit 1: Intro to forensic science

  2. Discuss with your neighbor How do detectives use logic to help them narrow down to one suspect? (think about your Deadly picnic)

  3. What are the rules of evidence? • Probative value: proves something related to the case • Most evidence collected at a scene has very little if any probative value • Example, in the case of a motor vehicle accident, a witness's testimony that she saw one automobile enter the intersection on a red light is a probative fact about whether the driver was at fault. • Material: evidence that addresses issue of crime

  4. What makes up Physical Evidence? • Transient: temporary, easily changed or lost • Usually observed by the first officer on the scene • Ex: odor, temperature, imprints or indentations, markings

  5. Types of Physical Evidence • Pattern or Transfer evidence- produced by direct contact between a person and an object or between two objects

  6. Types of Physical Evidence • Conditional- produced by a specific event or action • Important in crime scene reconstruction • Ex: lighting, smoke, location (stains, victim, vehicle, etc.) vehicles, body position, scene (condition of furniture, doors/windows) signs of disturbance

  7. Individual evidence Can be linked to a unique, single, specific source Class evidence Object has characteristics common to a group of similar objects Not to a single object What is the difference between Individual evidence and class evidence?

  8. Ticket out the Door • In your notebook, create a Venn diagram comparing individual and class evidence. • 2 differences, at least 1 similarity

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