Impressions -
An impression is the marks left at or near the crime scene by the perpetrator*, vitim or suspects*.
Impressions can be bite marks, tire tracks, ballistics*, tool marks, fingerprints and so on.
Some impressions could be faded and hard to see, but they are still vital to the crime scene and can help a great deal.
Footprint Analysis -
Footprint analysis is the analysis of impressions left by shoes or feet. We can discover the shoe type and brand, the age, the height and walking style with this. Different types of shoe prints can be Line and Circle tracks that had dureability to them, the toe arched up. This generally means the wearer is on their toes and has probably worn them a good deal of times.
Everyone's feet are different, they could have flat feet, a high arch or normal arch, the marks could be smudged (possibly meaning the have a limp of sorts).
Casting a footprint means carefully pouring casting mixture on the impression, waiting for it to dry before gently washing it off with water, revealing the full mark to then study it.
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Perpetrator - A person who carries out a harmful, illegal, or immoral act.
Suspects - Someone who may have caused the crime, or is thought to have had connections to it.
Ballistics - The study of bullets, their line of projectory.