Small amounts of chemicals, such as gunshot residue or explosives, can remain on a suspect’s hands or clothing. Bits of fiber, strands of hair, flecks of paint, or shards of glass are also often left at a crime scene or carried away from it. These are examples of trace evidence, and forensic scientists can use them to link items or suspects to a crime.
We develop methods for accurately detecting, measuring, and analyzing very small fragments and quantities of evidence, and we produce standard reference materials and data to help forensic laboratories validate the accuracy of their methods and measurements.
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