evidence considered to be final absolute proof of the existence of something; conclusive proof
The book itself, of course, is proof positive that the strangers came around.
Stewart, who is proof positive that 71 is the new 40, was being too humble by half.
The Goldman purchase of the Merrill CDOs is proof positive that the geniuses at Goldman screw up like everyone else.
If Undercovers is any example, it's proof positive that viewers aren't taking to Abrams-lite.
When commodities collapse it is proof positive we're heading for a serious recession.
This is proof positive that you never forget your first room in the Hall.
I know the young rascal, and have now proof positive that he is a smuggler!
Either he can Castle now; if not, then it is proof positive that his defence is bad.
“proof positive, Jack, that there are sea-snakes,” said Sir John.
Here was proof positive of Mr. Orban's words that one has but to think hard enough about a person to imagine one sees him.