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Hair under a microscope.

Credit: www.discoverychannel.co.uk/crime/criminalists
article: Locard's Exchange Principle 		Other images from this article
Edmund Locard -Director if the First Crime Lab. Hair under a microscope. Trace evidence: fibers can be compared. Paint chip left at a crime scene can be compared.
Hair under a microscope., www.discoverychannel.co.uk/crime/criminalists