Berkshire Hathaway (BRKa, BRKb) said late yesterday that former executive David Sokol violated the companys standards of conduct in his trading of shares of Lubrizol (LZ) prior to recommending a takeover of the company to Berkshire CEO Warren Buffett that. In particular, Berkshires audit committee advised the board of directors that Sokols having purchased Lubrizol shares while serving as a Berkshire representative in connection with a merger violated company policies in its Code of Business Conduct and Ethics and its Insider Trading Policies and Procedures.