evidence considered to be final absolute proof of the existence of something; conclusive proof
Stewart, who is proof positive that 71 is the new 40, was being too humble by half.
The war in Vietnam was proof positive that he was just wrong.
If Undercovers is any example, it's proof positive that viewers aren't taking to Abrams-lite.
The Goldman purchase of the Merrill CDOs is proof positive that the geniuses at Goldman screw up like everyone else.
The book itself, of course, is proof positive that the strangers came around.
This is proof positive that you never forget your first room in the Hall.
And if one can not be reformed by them, it is proof positive that he ought not to be at large.
Either he can Castle now; if not, then it is proof positive that his defence is bad.
In this way only, he urged, could proof positive be obtained.
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.