Federal prosecution of W.R. Grace and several of its top executives on conspiracy and related charges in connection with the company's former Libby, Montana vermiculite mine operation ended with acquittals on all counts. Link to Missoulian.com article. The charges alleged that the company knowingly endangered residents of Libby by operating its vermiculite mine with the knowledge it would release asbestos, and by covering up violations of the federal Clean Air Act and the potential danger of its mine operations. In response, the defendants pointed to actions the company took to address the dangers. Significantly, the court instructed the jury to discount testimony by a former company executive who testified on behalf of the prosecution. The jury, which returned its verdict following a day of deliberation, found no criminal liability.