The Supreme Court on Thursday announced that after a lengthy investigation it has been unable to conclusively identify the person who leaked an unpublished draft of an opinion indicating the court was poised to roll back abortion rights.

In an unsigned statement, the court said that all leads had been followed up and forensic analysis performed, but "the team has to date been unable to identify a person responsible by a preponderance of the evidence."

The Supreme Court has not been able to determine who leaked a draft of Justice Samuel Alito’s opinion in Dobbs v. Jackson Women’s Health Organization, the court said on Thursday.

The unprecedented leak last May revealed that the court was privately poised to overturn the court’s landmark decisions establishing a constitutional right to an abortion. The court indicated on Thursday that investigators would continue to review some additional evidence, but the court’s two-page statement left open the possibility that the source of the leak may never be found.

After nearly nine months of an investigation into who leaked a draft decision signaling overturning Roe v. Wade, the Supreme Court announced Thursday its investigation is inconclusive.

The court released a 20-page public copy of the investigation. Chief Justice John Roberts initially tapped the marshal of the Supreme Court to conduct the investigation, but Roberts later asked an outside group known as the Chertoff Group to aid in the process of the investigation.