"This is an undated photo of John Yoo, professor of law at the University of California at Berkeley. Students at the University of California, Berkeley's Boalt School of Law say a legal memo that Yoo co-wrote while working for the U.S. Department of Justice ""contributed directly to the reprehensible violation of human rights in Iraq and elsewhere,"" according to a petition being circulated among students and faculty. (AP Photo/University of California, Berkeley)   John Yoo   John Yoo   Ran on: 06-12-2004  UC law professor John Yoo   Ran on: 06-12-2004  ProductName Chronicle   Ran on: 10-24-2004  Timothy Flanigan   ALSO Ran on: 11-13-2005  Before going abroad, John Yoo (left) and David Addington (center) might study the case of Augusto Pinochet (right).  Ran on: 01-05-2008  John Yoo wrote memo. Photo: Associated Press"