Stewart Baker writes:
Ordinary Internet users, American and non-American alike, far outnumber legally targeted foreigners in the communications intercepted by the National Security Agency from U.S. digital networks, according to a four-month investigation by The Washington Post.
Nine of 10 account holders found in a large cache of intercepted conversations, which former NSA contractor Edward Snowden provided in full to The Post, were not the intended surveillance targets but were caught in a net the agency had cast for somebody else.
The story is built around the implied claim that 90% of NSA intercept data is about innocent people. I think the statistic is a phony. Especially in an article that later holds up US law enforcement practice as a superior model.
Read more on WaPo The Volokh Conspiracy.