Four cases are discussed, with the point in view that examination of oral cavity, trachea, hands and all injuries is a vital part of post-mortem examination for the administration of justice. The cases are as follows. 1. Alleged case of death due to faulty treatment by physician, in which the death was due to choking by a medicinal tablet given forcefully to the child by his grandmother. 2. A case of hanging in which examination of the left palm revealed a ball pen testing mark on the hypothenar region. 3. In a case of homicidal death, a metal fragment was found in an incised wound which became an important piece of evidence for the administration of justice. 4. A case of hanging in which the suicide note was found in the oral cavity.