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The practice contradicted what Mr. Verrilli had told the Supreme Court last year in a case challenging the law, the FISA Amendments Act of 2008. Legalizing a form of the Bush administration’s program of warrantless surveillance, the law authorized the government to wiretap Americans’ e-mails and phone calls without an individual court order and on domestic soil so long as the surveillance is “targeted” at a foreigner abroad. A group of plaintiffs led by Amnesty International had challenged the law as unconstitutional. But Mr. Verrilli last year urged the Supreme Court to dismiss the case because those plaintiffs could not prove that they had been wiretapped. In making that argument, he said a defendant who faced evidence derived from the law would have proper legal standing and would be notified, so dismissing the lawsuit by Amnesty International would not close the door to judicial review of the 2008 law. The court accepted that logic, voting 5-to-4 to dismiss the case. In a statement, Patrick Toomey, staff attorney with the American Civil Liberties Union, which had represented Amnesty International and the other plaintiffs, hailed the move but criticized the Justice Department’s prior practice.

Still, it remains unclear how many other cases — including closed matters in which convicts are already service prison sentences — involved evidence derived from warrantless wiretapping in which the National Security Division did not provide full notice to defendants, nor whether the department will belatedly notify them. Such a notice could lead to efforts to reopen those cases.

“They’ve spent hundreds and hundreds of man-hours trying to reconstruct everything he has gotten, and they still don’t know all of what he took,” a senior administration official said. “I know that seems crazy, but everything with this is crazy.”

In recent days, a senior N.S.A. official has told reporters that he believed Mr. Snowden still had access to documents not yet disclosed. The official, Rick Ledgett, who is heading the security agency’s task force examining Mr. Snowden’s leak, said he would consider recommending amnesty for Mr. Snowden in exchange for those documents.

“So, my personal view is, yes, it’s worth having a conversation about,” Mr. Ledgett told CBS News. “I would need assurances that the remainder of the data could be secured, and my bar for those assurances would be very high. It would be more than just an assertion on his part.”