You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Exchange of trace evidence occurs, when a person comes in contact with other person. This principle is called: and explain in detail?
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.