The Locard Exchange Principle says that "every contact leaves a trace."

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The Locard Exchange Principle is a fundamental concept in forensic science, which states that whenever two objects come into contact, there will be an exchange of materials between them. This exchange can take many forms, such as fibers, DNA, or fingerprints, and allows forensic experts to link people or things to specific locations or events. Therefore, the principle supports the idea that "every contact leaves a trace," which is crucial for solving crimes and identifying suspects.

The Locard Exchange Principle Says That "Every Contact Leaves a Trace