Today's Washington Post has an editorial about the DoJ's Office of Legal Counsel. Here's is how it begins:

Since its creation in the early 20th century, the Justice Department's Office of Legal Counsel has been considered the legal conscience of the executive branch, rendering judgments to presidents and executive agencies about what the law allows. The OLC responds to executive branch requests for clarifications on everything from how to determine annual leave for federal employees to whether treaty provisions are constitutional and how torture should be defined. Its opinions are binding on the executive and essentially carry the weight of law. Past OLC opinions continue to have force when a new administration begins, just as Supreme Court decisions enjoy the force of law long after the justices who made them have left the bench.

Unfortunately, during the Bush administration, the OLC has become known as a partisan enabler of legally and ethically questionable presidential policies, including those involving the use of torture. The OLC's decisions have eroded the legitimacy of the office and given legal cover to behavior that most Americans -- and most lawyers -- regard as improper.