attorney

In the United States, a district attorney (DA), state's attorney or state attorney is the chief prosecutor for a local government area, typically a county. The exact name and scope of the office varies by state. Alternative titles for the office include county attorney, commonwealth's attorney, solicitor, or county prosecutor.
The prosecution is the legal party responsible for presenting the case against an individual suspected of breaking the law, initiating and directing further criminal investigations, guiding and recommending the sentencing of offenders, and are the only attorneys allowed to participate in grand jury proceedings. The prosecutors decide what criminal charges to bring, and when and where a person will answer to those charges. In carrying out their duties, prosecutors have the authority to investigate persons, grant immunity to witnesses and accused criminals, and plea bargain with defendants.A district attorney leads a staff of prosecutors, who are most commonly known as deputy district attorneys (DDAs). The deputy who serves as the supervisor of the office is often called the assistant district attorney. The majority of prosecutions will be delegated to DDAs, with the district attorney prosecuting the most important cases and having overall responsibility for their agency and its work. Depending upon the system in place, DAs may be appointed by the chief executive of the jurisdiction or elected by local voters.