What principle did a French criminologist propose regarding the contact between objects?

The principle that a French criminologist proposed regarding the contact between objects is known as Locard's principle of exchange. This principle, established by Dr. Edmond Locard, asserts that when two objects come into contact with one another, there is always a transfer of material from one to the other. This means that whenever a perpetrator touches a surface, they will leave behind trace evidence, and conversely, they may pick up trace evidence from that surface.

Locard's principle is foundational in forensic science and plays a crucial role in investigations. It underscores the significance of collecting and analyzing trace evidence, which can establish associations between a suspect and a crime scene. This principle is essential for forensic nurses and investigators, as it enhances the understanding of how physical evidence can be linked to individuals involved in criminal activity. The other options do not reflect the widely recognized terminology or concept put forth by Locard, making this the most appropriate answer.