[JURIST] Defense lawyers for I. Lewis "Scooter" Libby [CBS News profile], the former chief of staff for Vice President Dick Cheney indicted last October in the CIA leak case [JURIST news archive], petitioned Monday to use classified evidence in his trial, a move that could delay the case. The request and the documents are classified but defense lawyers hinted that they want to use the nature of Valerie Plame's work in the CIA as evidence. The lawyers claim Plame's work is among the "significant disagreements" they have with Special Counsel Patrick Fitzgerald [official website]. US District Judge Reggie B. Walton [official profile] will decide what evidence will be presented to the jury based on the Classified Information Procedures Act [text], passed by Congress in 1980. In November Libby pleaded not guilty [JURIST report] to charges [PDF indictment; JURIST report] of obstructing justice, perjury and making false statements. AP has more.