Forensic psychiatry is a subspecialty of psychiatry. It encompasses the interface between law an psychiatry. Some practitioners of forensic psychiatry have taken extra training in that specific area. In the United States one year fellowships are offered in this field to psychiatrists who have completed their general psychiatry training. In Britain one is required to complete a three-year subspeciality training in forensic psychiatry, after completing one's general psychiatry training, before receiving a Certificate of Completion of Training as a forensic psychiatrist. In some countries general psychiatrists can practice forensic psychiatry as well. However, some countries, such as Japan, require a specific certification from the government to do this type of work.