NSA deletes 685 million call records obtained since 2015

That points to a failure of the program, according to David Kris, a former top national security official at the Justice Department.
“They said they have to purge three years’ worth of data going back to 2015, and that the data they did collect during that time - which they are now purging - was not reliable and was infected with some kind of technical error,” said Kris, founder of Culper Partners, a consulting firm in Seattle. “So whatever insights they were hoping to get over the past three years from this program of collection … is all worthless. Because of that, they are throwing all the data away and basically starting over.”
Christopher Augustine, an NSA spokesman, disagreed with the claim that the program had failed.

https://www.infowars.com/nsa-deletes-over-685-million-call-records-due-to-technical-irregularities/