Some dogs have potential capabilities that, based on the special training they receive, can convey clear messages to their trainers, using these capabilities Especially in the direction of discovering the crime or collecting evidence in the direction of discovering the criminal truth, he can provide certain evidences and emirates to the court judge or the investigator in the preliminary investigation, considering that the body odor of people, like their fingerprints, is unique to It is a person, and long after the person leaves the environment, his smell remains in that place, and this personal smell can only be understood by trained detective dogs, and it is beyond the ability of humans to smell, so in In other countries, such as Germany and Turkey, there are centers for training such dogs, and different opinions have been issued with the benefit of this special ability. dogs is in creating devices using artificial intelligence, which, like these dogs, is obtained with the smell sample that is found in the environment on the traces and signs discovered from the environment and to The memory has been assigned to match the personal smell of the suspect or the accused and to verify the attribution of this smell with the smell of the discovered instruments of the crime and to provide a reason or proof for the attribution of the crime to the accused. In this research, the role of these dogs in the direction of discovering and verifying the evidence of crime has been explained in detail with the library method.