Examination of evidence for fiber transfer can provide a valuable means of helping to establish association between two or more persons, or between a person and either a crime scene or an object.

Fibers are first classified as to being natural or synthetic, then the type of fiber is determined using polarized light microscopy and Fourier Transform Infrared Spectrometry (FTIR). Other fiber characteristics examined include color and cross-sectional shape.

Fiber Microscope
A polarized Light Microscope
Nylon Fiber
A nylon fiber viewed with a polarized light microscope between crossed polars.