The Supreme Court ruled 5-4 to reverse the Ninth Circuit's decision in the case. The majority wrote:
In cases where an applicant for federal habeas relief is not barred from obtaining an evidentiary hearing by 28 U. S. C. §2254(e)(2), the decision to grant such a hearing rests in the discretion of the district court. Here, the District Court determined that respondent could not make out a colorable claim of ineffective assistance of counsel and therefore was not entitled to an evidentiary hearing. It did so after reviewing the state-court record and expanding the record to include additional evidence offered by the respondent. The Court of Appeals held that the District Court abused its discretion in refusing to grant the hearing. We hold that it did not.
Read the Court's opinion per Justice Thomas, along with a dissent from Justice Stevens.