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Forensic experts, also called criminalists, use the instruments of science and engineering to examine physical evidence. They use spectroscopes, microscopes, gas chromatographs, infrared and ultraviolet light, microphotography, and other lab measuring and testing equipment to analyze fibers, fabric, dust, soils, paint chips, glass fragments, fire accelerants, paper and ink, and other substances in order to identify their composition and origin. They analyze poisons, drugs, and other substances found in bodies by examining tissue samples, stomach contents, and blood samples. They analyze and classify blood, blood alcohol, semen, hair, fingernails, teeth, human and animal bones and tissue, and other biological specimens. Using samples of the DNA in these materials, they can match a person to a sample of body tissue. They study documents to determine whether they are forged or genuine. They also examine the physical properties of firearms, bullets, and explosives.