At the start of 2003... [George W. Bush] was prosecuting a mostly clandestine war on terrorism, which even included--on at least one known occasion--the CIA covertly assassinating suspected enemies with remote-controlled drones in Yemen. (David Corn, The Lies of George W. Bush, page 241)
Remote-controlled drones? Doesn't that seem like it deserves an "according to..." or at least a footnote? Suddenly, in the middle of an otherwise carefully cited book which seeks to base its criticism of President Bush on facts instead of rhetoric, we're deep in the mud of Conspiracy Land.
It turns out this sentence is true, admittedly. But gee whiz, David, couldn't you have at least said "as reported in Newsweek"?