A facebook comment on the intelligence community's "high confidence"

http://www.nytimes.com/…/…/politics/russian-hack-report.html

JB on Facebook [edited here]: What does "high confidence" actually mean (see below)? The "confidence" one supposedly gets after smoking marijuana/drinking vodka? A way of saying "I'm not so sure"? A putative affirmation of what is (definitely?) "concluded" (see below NYT headline)? Avoiding getting blamed for being wrong?

What Intelligence Agencies Concluded About the Russian Attack on the U.S. Election

In unequivocal language, the unclassified version of the report for President Obama pins responsibility directly on President Vladimir V. Putin.

NYTIMES.COM|BY SCOTT SHANE