For this assignment you will assume the role of a trained lab analyst. You oversee the impression evidence department and have been asked to mentor the new laboratory technicians who were just hired. As someone with knowledge of impression-style evidence, you must create an informative training session on the basics of impression evidence.
Sample Answer
Sample Answer
Training Session: Basics of Impression Evidence
Slide 1: Title Slide
[Insert title of the presentation]
Slide 2: Introduction about Pattern Recognition
Impression evidence refers to any type of evidence left behind by an object that has made contact with a surface.
Pattern recognition is a crucial skill in analyzing impression evidence.
It involves identifying, documenting, and analyzing various types of impressions, such as footwear and tire tracks.
Slides 3 and 4: Documentation in Footwear and Tire Track Impressions
Footwear Impressions
Documentation sought:Size and shape of the impression
Pattern design and characteristics
Wear or damage marks
Unique features or individual characteristics
Tire Track Impressions
Documentation sought:Overall pattern design
Tread design and characteristics
Size and shape of the impression
Wear or damage marks
Unique features or individual characteristics
Slides 5, 6, and 7: Collection Methods of Footwear and Tire Track Impression Evidence
Footwear Impression Evidence Collection
Photography:
Take overview photographs to capture the entire impression.
Use a scale or ruler to document the size accurately.
Photograph from multiple angles to capture all details.
Casting:
Use dental stone or other suitable casting materials.
Pour the casting material carefully onto the impression.
Allow sufficient time for the cast to harden before removing.
Lifts:
Use adhesive lifters or gelatin lifts to lift the impression.
Apply the lifter to the impression carefully, ensuring full contact.
Transfer the lifted impression onto a suitable backing material.
Tire Track Impression Evidence Collection
Photography:
Capture overview photographs of the entire tire track.
Use a scale or ruler to document the size accurately.
Photograph from multiple angles to capture all details.
Casting:
Use dental stone or other suitable casting materials.
Pour the casting material carefully onto the tire track.
Allow sufficient time for the cast to harden before removing.
Lifts:
Use adhesive lifters or gelatin lifts to lift the tire track.
Apply the lifter to the tire track carefully, ensuring full contact.
Transfer the lifted tire track onto a suitable backing material.
Slides 8 and 9: Impression vs. Source
Impression: The mark or pattern left behind on a surface by an object, such as a shoeprint or tire track.
Source: The object that created the impression, such as the shoe or tire itself.
[Include photographs of a shoeprint/impression at 90 degrees with a ruler next to it, and a photograph of the bottom of the shoe that created it]
Slide 10: Conclusion
Understanding impression evidence is crucial for analyzing and interpreting crime scenes.
Documenting and collecting footwear and tire track impressions accurately is essential for further analysis.
Distinguishing between impressions and their sources is important for linking evidence to potential suspects.
Slide 11: References
[Include a list of references used in creating the presentation]
