HOOVER, Ala. - A new Homeland Security program aims to analyze existing, legally collected computer data, not gather new personal information on U.S. citizens, Secretary Michael Chertoff said Friday in defending the program from congressional critics. The project, still in pilot stage, will help investigators understand evidence gathered through subpoenas but won't troll computers for new, private information, Chertoff said in an interview with The Associated Press. "It's an experiment to see how you can better analyze data that you already have, that you've already legally collected, to see if you can understand it, sort it and make use of...