Question

Which of these is an example of the exchange principle?

A Making casts of footprints at the crime scene
B Taking photographs of the scene to be used later
C Leaving markers to show the location of evidence
D Leaving a strand of hair on a murder victim

Answer 1

The best example of the exchange principle among the given options is 'Leaving a strand of hair on a murder victim'. This illustrates how transfer of evidence occurs between individuals and objects at a crime scene.

Step-by-step explanation:

The exchange principle in forensic science, often associated with Dr. Edmond Locard's theory, suggests that contact between two surfaces will result in an exchange of materials. Applying this principle to a forensic investigation, we would look for examples where evidence is transferred between the perpetrator, the victim, and the crime scene.The main answer to which of the provided options best exemplifies the exchange principle is Leaving a strand of hair on a murder victim. This is because, according to the exchange principle, when a perpetrator comes into contact with a victim during the commission of a crime, there could be a transfer of material such as hair, fibers, or bodily fluids, which can then be used as forensic evidence.In conclusion, the exchange principle is crucial in forensic investigations as it allows detectives to link suspects to crime scenes or victims through material evidence left behind during the exchange.