But U.S. District Judge Denise Cote ruled that Sharkey couldn't testify about Madoff and Know Your Customer investigations at JPMorgan Chase in the wake of the fraud's exposure because it could unfairly prejudice jurors against the bank. In an unrelated case, a former JPMorgan private client adviser claimed in a March lawsuit that he was fired for blowing the whistle on potential Dodd-Frank Act violations to upper management. Bradley Sayre said he was told to toss out notes in his files and destroy fraudulent sales materials while the bank was negotiating a settlement with the Justice Department over fraudulent sales of collateral backed securities. The bank has sought a dismissal of the case, saying Sayre is pursuing the same claims in arbitration. The case is Sharkey v. JPMorgan Chase & Co., 10-cv-03824, U.S. District Court, Southern District of New York (Manhattan). Updates with Lassiter testimony.