The states that whenever the perpetrator of a crime comes into contact with the scene, he or she will both bring something into the scene and leave with something from the scene. In other words, this principle asserts that every contact leaves minimally, a trace of evidence.

The answer is "Locard's principle".

Explanation:

In today's federal authorities, the basic principle is formulated by Locard's principle transfer, it is the basic principle, that is "each touch left a trace", Therefore, after leaving traces, no suspect can leave the area.

In this principle, all carry into the picture and leave the area to something. This theory, in many other words, states that any interaction leaving a residue of proof, superficially.

- Locard's Principle.

Explanation:

The 'Locard's Principle' also known as 'Locard's exchange principle' demonstrates that a perpetrator or culprit involved in a crime will take some objects/things with him/her or leave some things behind him/her when he/she enter or depart the crime scene like hair, blood, DNA, fingerprints, etc. which can further be used as a forensic evidence. He stated that 'every contact leaves a trace' which formulated into his basic principle in forensic science which states that these traces can be used as evidence to investigate the crime and clues to search for the culprit.

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