The certificates for the insurances are medical testimonies based on this principle: the truth, all the truth, nothing but the truth. They must give to the insurance the informations which are essential for building the patient's file, but they must respect the rules of ethics and the laws concerning the protection of privacy and the patient's rights. The certificate giving the description of the traumatic lesions is essential in all the procedures but the physician must know what to write and to whom this document must be delivered. In common law, where the victim must prove the lesions and their traumatic origin, the certificate is due to the patient himself. In industrial accidents, the specific law of 10 April 1971 dictates the contents of the several certificates: report of the lesions, recovery, review. In personal insurance, the law concerning the patient's rights teaches the limits of the information and to whom it must be given. The certificate is a service and a right of the victim; it must be quite relevant.