Thursday 8 March Topic: Footprints!
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Transcript of Thursday 8 March Topic: Footprints!
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Thursday 8 MarchTopic: Footprints!
Do now:- What types of traits of a footprint do you think can be analyzed? (e.g. how long is the print?)-What types of surfaces can have footprint evidence?- What situations can you think of that would require footprint evidence analysis?
NO HW! YAY!
OBJECTIVE: You will be able to explain how footprint analysis is useful on a crime scene
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Quick Recap…•1 minute summary of the results of the
ink chromatography lab: the blue ink smudged more
•Blue wasn’t clear•Blue stains stopped•Some ink separated on both thingies •Polar/nonpolar means somehing
OBJECTIVE: You will be able to explain how footprint analysis is useful on a crime scene.
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When to analyze footprints?• • • • •
OBJECTIVE: You will be able to explain how footprint analysis is useful on a crime scene.
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Impressions Evidence•What is it?
▫ Physical mark left on a surface•What are the 3 types?
▫ Tool marks, foot, tire treads
OBJECTIVE: You will be able to explain how footprint analysis is useful on a crime scene.
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Footprints – what to analyze:•Outsole impressions
▫left on an object due to contact with footwear▫Walking on surfaces, kicking down a door,
climbing over surfaces▫Visible prints versus LATENT prints (have to
use special materials to make the print visible)
OBJECTIVE: You will be able to explain how footprint analysis is useful on a crime scene.
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Footprints – what to analyze:•Insole imprints
▫How the foot presses upon the inside of the footwear
▫Best with brands that are designed to mold to the foot
OBJECTIVE: You will be able to explain how footprint analysis is useful on a crime scene.
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Footprints – what to analyze:•Trace evidence
▫Materials that can be transported from location to location via footwear
▫E.g. glass shards, fibers, blood, dirt, construction materials, etc.
OBJECTIVE: You will be able to explain how footprint analysis is useful on a crime scene.
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Outsole Impressions•Measurements/observations to note:
▫Length▫Width▫Angle of impact▫Weight distribution▫Tread patterns▫Identifying marks▫Brand & type of shoe
OBJECTIVE: You will be able to explain how footprint analysis is useful on a crime scene.
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