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

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.

When to analyze footprints?• • • • •

OBJECTIVE: You will be able to explain how footprint analysis is useful on a crime scene.

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.

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.

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.

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.

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.