Locard's exchange principle states that a criminal always removes something from the crime scene or leaves behind incriminating evidence.

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Locard's exchange principle is based on the idea that every contact leaves a trace. This means that whenever two objects come into contact, there will be an exchange of materials. In a criminal investigation, this principle suggests that the criminal will inevitably leave behind some kind of physical evidence, even if they take steps to cover their tracks. Conversely, they may also inadvertently pick up trace evidence from the crime scene that could later be used against them.

Locard's Exchange Principle States That a Criminal Always Removes Something