From 2002 to 2005, Weissmann was deputy director and then director of the task force investigating the
Enron scandal.
[1] His work resulted in the prosecution of more than 30 people for crimes including perjury, fraud, and obstruction including three of Enron's top executives,
Andrew Fastow,
Kenneth Lay. and
Jeffrey Skilling. In a follow-up case in U.S. District Court, Weissmann also was successful at arguing that auditing firm
Arthur Andersen LLP had covered up for Enron. In that case, which resulted in the destruction of Andersen, he convinced the district judge to instruct the jury that they could convict the firm regardless of whether its employees knew they were violating the law.
[3] That ruling was later unanimously overturned by the
Supreme Court in
Arthur Andersen LLP v. United States, in which the court held that "the jury instructions failed to convey the requisite consciousness of wrongdoing."
[3]