Ans: It is a certificate that is issued by the attending doctor when he/she examines a patient and comes to the conclusion that a certain investigation is necessary by law enforcement agencies to find the cause behind the ailment or injury in question.  The certificate contains the details of injuries sustained by a person and can be used as evidence in case he/she becomes part of a criminal trial.  Policyholders are required to submit a Medico-Legal Certificate to the health insurance providers if they are admitted to the hospital after an accident.