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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
When a person comes in contact with other there is transfer of material from one to another. This is called:
assistant
The correct answer is  Locards principle of exchange states that when two objects come into contact with each other, there is always some transfer of maternal from one to the other. Ref: Parikh's Textbook of Medical Jurisprudence Forensic Medicine and Toxicology, 6th Edition, Pages 5.35, 7.35