A special prosecutor is a prosecutorial lawyer from the private sector chosen to investigate, indict and prosecute government officials. While prosecuting a government official suspected of illegal activity would normally fall to a US attorney, a district attorney or an attorney general, the close political relationship of one branch of government to another would suggest that a prosecution conducted by someone employed by the same government, or same branch of government may not be impartial. In these cases, the government may ask a private sector lawyer to serve as special prosecutor, so that no partiality exists in pursuing the case.
Many countries employ a special prosecutor when it comes to cases where a government official stands accused. Partiality may exist with lawyers working for the government already because they may have a direct relationship with the accused, they may have gained political power through the defendant’s political position, or they may be employed by the accused. On the other hand, if the government-employed prosecutor is openly opposed to the defendant’s political party, he or she may prosecute injudiciously. Thus in most cases, a special prosecutor must be employed so that no relationship between the defendant and the prosecutor exists.
In the 2006/2007 trials that accused Scooter Libby of leaking confidential information about a member of the CIA, Patrick Fitzgerald was appointed special prosecutor. A special prosecutor with significant fame was Leon Jaworski, who was appointed as the prosecutor in the case of the United States v. Nixon. Jaworski, after pursuing the case for 11 months quit suddenly. He was angry that President Ford had already issued a presidential pardon to former President Nixon, prior to the conclusion of the trial. Further, as he’s stated in interviews since, he missed his home in Texas.
Special prosecutor Kenneth Starr was well known for his pursuit of President Clinton during first the Whitewater Scandal, and then the Monica Lewinsky Sex Scandal. Though Starr as prosecutor did impeach Clinton, the senate voted to acquit him.