Exchange of trace evidence occurs, when a person comes in contact with other person. This principle is called:: (A) Locard's principle, (B) Quetelet's rule, (C) Petty's principle, (D) None of the above
Answer is A. Locard's Principle of Exchange: It states that "When two objects come into contact with each other, there is always transfer of some material between them" This is helpful in crime investigations, especially in sexual offences.