A massive computer crash that destroyed hundreds of the Texas attorney general's confidential documents may prevent scores of Medicaid fraud prosecutions. As much as 50% of the Tyler Medicaid fraud division's files were destroyed in July when a server being repaired by a state vendor would not restart. In an apparent oversight, the documents lost were not backed up. As a result, evidence crucial to convicting dishonest healthcare providers who ripped off the state's health insurance program for the poor may never be recovered.