How Crime Scene Analysts Collect and Preserve Fingerprints
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CSI
Nast
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Condé Nast
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Mark Twain
Matthew Steiner
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US
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Summary
Preserving fingerprints can help definitively link a person to a crime, especially since the US government maintains biometric databases of prints from millions of people—including previously convicted and suspected criminals, government employees, military personnel, and others.To learn more about the science of fingerprint collection, WIRED caught up with Matthew Steiner, a certified senior crime-scene analyst with more than 20 years of experience. Steiner uses a special white powder to gently dust fingerprints, making them visible to the human eye.
As said here by Wired