<prompt> The principle that states when any two objects come into contact, there is always a transfer of material from each object on the other is called?Locards principleQuetelets ruleMcNautons principleGettlers principle  <response>: When any two objects come into contact, there is always a transfer of material from each object on the other. This called Locards exchange principle. Ref: The Essentials of Forensic Medicine Toxicology Dr.K.S.Narayan Reddy, 29th Edition, Page 442 