MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Fibre analysis. Light micrographs of several types of clothing fibres found in a bathroom where a crime took place. The fibres will be compared to fibre samples taken from a suspect. If the samples match, then the suspect will have been placed at the scene of the crime. It is possible to tell if fibres are natural (animal hair) or artificial. Clothing fibres can also be analysed for dyes and for trace substances they have absorbed. If human hairs are also present, further analysis can sometimes reveal the suspect's race and diseases that affect hair growth. Hair from a suspect can also be directly compared to see if it matches any hair found at the crime scene.
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