It’s IntLawGrrls’ great pleasure to welcome as a guest blogger today our colleague Dawn Johnsen (left), Professor of Law and Ira C. Batman Faculty Fellow at the University of Indiana, Bloomington, School of Law. A scholar of the constitutional law of the United States, Dawn’s accomplishments include service as the Legal Director of the National Abortion & Reproductive Rights Action League from 1988 to 1993. Just before joining academia, she spent several years as an attorney in the Office of Legal Counsel of the U.S. Department of Justice, serving as its Acting Assistant Attorney General in 1997 and 1998. At OLC she was responsible for advising the United States’ Attorney General and White House Counsel, as well as the general counsels of all U.S. executive departments and agencies. Her experience gives her special expertise to write, as she does below in her guest post about how the Department of Justice should go about investigating the United States’ post-9/11 use of waterboarding as a tool of interrogation.