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A district attorney (D.A.) is, in some U.S. jurisdictions, the title of the local public official who represents the government in the prosecution of alleged criminals. The district attorney is the highest officeholder in the jurisdiction's legal department and supervises a staff of assistant district attorneys. Similar functions are carried out at the local level in other jurisdictions by officers named the Commonwealth's Attorney, State's Attorney, County Attorney, or County Prosecutor. Depending on the system in place in the particular state or county, district attorneys may be appointed by the chief executive of the region or elected by the people.
Because different levels of government in the U.S. operate independently of one another, there are many differences between persons who perform this function at the federal, state, and county levels. The proper title for an appointed federal prosecutor at the local level (as opposed to an appointed U.S. Department of Justice prosecutor based in Washington, DC) is United States Attorney. Such officers are appointed by the President of the United States, serve under the Attorney General, and prosecute cases in the district courts of the federal government. United States Attorneys, in turn, hire prosecutors to handle the daily affairs of the office; they are known as Assistant United States Attorneys, or AUSAs.
Most states also have a district attorney who oversees prosecutions throughout the state. A district attorney of a state is occasionally informally referred to as the state's attorney. Care should be taken to not confuse the two.
The equivalent position in some areas of the United Kingdom and many Commonwealth countries is the Crown Prosecutor. In Canada, it is Crown Attorney or Crown Counsel and in Scotland the position is comparable with the Procurator Fiscal.