What is the official name of the evidence transfer that occurs on contact between objects?

What is the official name of the evidence transfer that occurs on contact between objects?

• A. Cross-Transfer Principle
• B. Locard Exchange
• C. Exchange Principle
• D. Contact Transfer

Answer: (B)

The fundamental idea is that contact between objects results in a transfer of material, leaving traces that can connect a person, a scene, or an object to a crime. This is encapsulated in Locard’s Exchange Principle, named for Edmond Locard, which states that every contact leaves a trace and that material is exchanged in both directions. This principle explains why trace evidence—like fibers, skin cells, or dust—can be used to link individuals or locations to an incident, even if nothing obvious is visibly disturbed. The formal term commonly used for this concept is Locard’s Exchange Principle, though you’ll often see the shorter form “Locard Exchange.” Other phrases described here aren’t the standard, widely recognized name for this idea, which is why Locard’s version is the best answer.

The fundamental idea is that contact between objects results in a transfer of material, leaving traces that can connect a person, a scene, or an object to a crime. This is encapsulated in Locard’s Exchange Principle, named for Edmond Locard, which states that every contact leaves a trace and that material is exchanged in both directions. This principle explains why trace evidence—like fibers, skin cells, or dust—can be used to link individuals or locations to an incident, even if nothing obvious is visibly disturbed. The formal term commonly used for this concept is Locard’s Exchange Principle, though you’ll often see the shorter form “Locard Exchange.” Other phrases described here aren’t the standard, widely recognized name for this idea, which is why Locard’s version is the best answer.