More on Thursday's historic Court decision: Under the federal sentencing guidelines, which penalize defendants who choose to go to trial and can sharply increase sentences based on factors like the financial losses involved, a federal judge in Houston sentenced Mr. Olis, a 38-year-old midlevel executive with an infant daughter, to 24 years in prison. On Thursday, in striking down Washington State's sentencing law, the Supreme Court almost certainly also doomed the federal guidelines that generated Mr. Olis's sentence and hundreds of thousands like it. That means Mr. Olis, who has started serving his sentence while the courts consider his appeals, may be entitled to a much shorter prison term. In light of the decision, said Frank O. Bowman, an author of a treatise on sentencing law, "Olis's sentencing range would probably be zero to six months." Thursday's decision requires any factor that increases a criminal sentence, except for prior convictions, to be proved to a jury beyond a reasonable doubt. Many sentencing schemes allow or require judges to impose longer sentences based on all sorts of criteria, including the defendant's background and the nature and severity of his crime. The decision may also affect sentencing laws in at least seven states in addition to Washington and the federal system, said Kevin R. Reitz, an expert on sentencing at the University of Colorado. In all of those jurisdictions, many people sentenced in recent years may be expected to challenge their sentences. And prosecutors, defendants and judges in pending and new cases will face an altered landscape. "It throws the whole country's criminal system into turmoil," said Professor Bowman, who teaches law at Indiana University.