South Korea's Rule on Special Prosecutors

A special prosecutor being considered by South Korea's parliament would be independent, and would have the authority to look into suspected illegal acts by senior government officials -- including those who may be in positions to influence legal probes.

If lawmakers approve the move, they would propose 2 candidates. Then the president is able to choose which would become the special prosecutor.

In 2008, a special prosecutor questioned then president-elect Lee Myung-bak over fraud allegations but he was not indicted.

Earlier this month, Park said she would accept an investigation by a special prosecutor if necessary -- although as president, she cannot be charged with a crime other than treason.