Officials Say U.S. May Never Know Extent Of Snowden's Leaks

Officials Say U.S. May Never Know Extent Of Snowden's Leaks
FILE - In this file image made from video released by WikiLeaks on Friday, Oct. 11, 2013, former National Security Agency systems analyst Edward Snowden speaks during a presentation ceremony for the Sam Adams Award in Moscow, Russia. In an interview with the New York Times posted to its website on Thursday, Oct. 17, 2013, Snowden says that he did not take any secret NSA documents to Russia and that intelligence officials in China as well as Russia could not get access to the documents he had obtained before leaving the United States. (AP File Photo)
FILE - In this file image made from video released by WikiLeaks on Friday, Oct. 11, 2013, former National Security Agency systems analyst Edward Snowden speaks during a presentation ceremony for the Sam Adams Award in Moscow, Russia. In an interview with the New York Times posted to its website on Thursday, Oct. 17, 2013, Snowden says that he did not take any secret NSA documents to Russia and that intelligence officials in China as well as Russia could not get access to the documents he had obtained before leaving the United States. (AP File Photo)

WASHINGTON — American intelligence and law enforcement investigators have concluded that they may never know the entirety of what the former National Security Agency contractor Edward J. Snowden extracted from classified government computers before leaving the United States, according to senior government officials.

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