The divergent messages from the CIA and the FBI put a spotlight on the difficulty faced by intelligence and law enforcement officials as they try to draw conclusions about the Kremlin’s motives for hacking Democratic Party emails during the 2016 race. Officials are frequently looking at information that is fragmentary. They also face issues assessing the intentions of a country expert at conducting sophisticated “influence” operations that made it hard — if not impossible — to conclusively detect the Kremlin’s elusive fingerprints.

The competing messages, according to officials in attendance, also reflect cultural differences between the FBI and the CIA. The bureau, true to its law enforcement roots, wants facts and tangible evidence to prove something beyond all reasonable doubt. The CIA is more comfortable drawing inferences from behavior.

“The FBI briefers think in terms of criminal standards — can we prove this in court,” one of the officials said. “The CIA briefers weigh the preponderance of intelligence and then make judgment calls to help policymakers make informed decisions. High confidence for them means ‘we’re pretty damn sure.’ It doesn’t mean they can prove it in court.”

The FBI is not sold on the idea that Russia had a particular aim in its meddling. “There’s no question that [the Russians’] efforts went one way, but it’s not clear that they have a specific goal or mix of related goals,” said one U.S. official.