Whitewater figure Susan McDougal remains adamant. She says she has no pertinent information on President Clinton and the first lady's business dealings in Arkansas and insists she is ready to go back to prison. McDougal, who has already served 18 months on a civil contempt citation, goes on trial today facing a three-count indictment alleging criminal contempt and obstruction of justice for refusing to answer Starr's questions about the Clintons. The trial, which is expected to last a month, will be McDougal's third in three years. If convicted, she could get more prison time and face a fine up to $750,000. The trial may be the last bit of business for Starr's Little Rock office after a 4{-year investigation of Whitewater. U.S. District Judge George Howard Jr. said last week he would consider allowing evidence of "prosecutorial misconduct or outrageous government conduct," specifically whether Starr wanted McDougal to lie about the Clintons' business deals. _ Information from the Los Angeles Times was used in this report.