WASHINGTON (AP) — The Justice Department violated the constitutional rights of a close friend of James Comey and must return to him computer files that prosecutors had hoped to use for a potential criminal case against the former FBI director, a federal judge said Friday.

The ruling from U.S. District Judge Colleen Kollar-Kotelly represents not only a stern rebuke of the conduct of Justice Department prosecutors but also imposes a dramatic hurdle to government efforts to seek a new indictment against Comey after an initial one was dismissed last month.

The order concerns computer files and communications that investigators obtained years earlier from Daniel Richman, a Comey friend and Columbia University law professor, as part of a media leak investigation that concluded without charges. The Justice Department continued to hold onto those files and conducted searches of them this fall, without a new warrant, as they prepared a case charging Comey with lying to Congress five years ago.

Richman alleged that the Justice Department violated his Fourth Amendment rights by retaining his records and by conducting new warrantless searches of the files, prompting Kollar-Kotelly to issue an order last week temporarily barring prosecutors from accessing the files as part of its investigation.

The Justice Department said the request for the return of the records was merely an attempt to impede a new prosecution of Comey, but the judge again sided with Richman in a 46-page order Friday that directed the Justice Department to give him back his files.

“When the Government violates the Fourth Amendment’s prohibition on unreasonable searches and seizures by sweeping up a broad swath of a person’s electronic files, retaining those files long after the relevant investigation has ended, and later sifting through those files without a warrant to obtain evidence against someone else, what remedy is available to the victim of the Government’s unlawful intrusion?” the judge wrote.

One answer, she said, is to require the government to return the property to the rightful owner.

The judge did, however, permit the Justice Department to file an electronic copy of Richman’s records under seal with he Eastern District of Virginia, where the Comey investigation is based, and suggested prosecutors could try to access it later with a lawful search warrant.

The Justice Department alleges that Comey used Richman to share information with the news media about his decision-making during the FBI’s investigation into Hillary Clinton’s use of a private email server. Prosecutors charged the former FBI director in September with lying to Congress by denying that he had authorized an associate to serve as an anonymous source for the media.

That indictment was dismissed last month after a federal judge in Virginia ruled that the prosecutor who brought the case, Lindsey Halligan, was unlawfully appointed by the Trump administration. But the ruling left open the possibility that the government could try again to seek charges against Comey, a longtime foe of President Donald Trump. Comey has pleaded not guilty, denied having made a false statement and accused the Justice Department of a vindictive prosecution.

The Comey saga has a long history.

In 2017, he testified that he had given Richman a copy of a memo he had written documenting a conversation he had with Trump and had authorized him to share the contents of the memo with a reporter. After that testimony, Richman permitted the FBI to create an image, or complete electronic copy, of all files on his computer and a hard drive attached to that computer.

Then, in 2019 and 2020, the FBI and Justice Department obtained search warrants to obtain Richman’s email accounts and computer files as part of a media leak investigation that concluded without charges.

But Richman said the Justice Department violated his rights by searching his files in September, without a new warrant, as part of an entirely separate investigation.

Eric Tucker, The Associated Press