A 19th-century forensic handbook details how to examine rust on a nail head to determine if it was new at a crime scene.
This chapter from Hans Gross's 19th-century forensic handbook examines the precise science and numerous pitfalls of analyzing footprints as criminal evidence. It critiques common measurement errors, details environmental factors that distort impressions, and concludes with a cautionary tale about flawed investigative practices.

As heard by us

Tiny errors matter when a footprint has to stand up in court.

This episode covers the practical task of measuring footprints and other impressions, and it does so with more care than speed. The strongest points come from the way it shows how a foot can change with cold, rest, heat, and exertion, which means even a measurement that looks…

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You need the calmest possible guide to footprint comparison.

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