sentences:  The NBCI works closely with other Garda units, and law enforcement agencies from other countries when there is an international dimension to investigations, such as the Police Service of Northern Ireland (PSNI), Metropolitan Police Service and National Crime Agency (NCA) in the United Kingdom.The NBCI operates from the Dublin Metropolitan Region (DMR) Headquarters of the Gardaí in Harcourt St, Dublin 2.NBCI officers are mostly experienced detectives, who have been promoted to the unit from other investigative units, and the majority have spent time as local/regional detectives.