Material, Hair and Fibre Analysis

by KDP  

IMPRESSION / PHYSICAL l EVIDENCE

Shoe Prints, tool marks, tire tracks, bite marks and marks on a fired bullet are examples of impression evidence.  Anything with enough force to leave an impression of the object could be evidence in a crime scene. 

Collection of impression evidence can be accomplished using several methods:

2-D: This type of impression is documented using photography. Some impressions may be dusted with fingerprint powder to be photographed or lifted with tape. They may also be collected using an electrostatic dust lifting process.

3-D: This type of impression can be documented using photography as well as by casting, which involves using dental stone or a similar substance to preserve the dimensional characteristics of the print.

To find out more how materials and are used to solve crimes click here

https://sciencespot.net/Media/FrnsScience/impsevidcard.pdf

Power of Evidence: Physical Evidence (PPT) <https://sciencespot.net/Media/FrnsScience/physicalevidence09.ppt>

Worksheet on Physical Evidence <https://sciencespot.net/Media/FrnsScience/physevidwkst.pdf>

HAIR AND FIBRE ANALYSIS

Hairs & Fibers (PPT) <https://sciencespot.net/Media/FrnsScience/Hairsfibers08.ppt>

Hair and Fibre Worksheet <https://sciencespot.net/Media/FrnsScience/hairfibernotewkst.pdf>

 

Here we are looking through a microscope at hair samples.  Matthew showed up how to make a wet mount. ?: