Once you are able to give me proof positive, do please come back and discuss it.

Only in that way, Jupiter said, could they have positive proof.

Absolute, positive proof and she wasn't able to record it.

Enemies of the Committee, yes; they had positive proof those were out there.

No later than yesterday afternoon did he give me most positive proof of his obsession.

Here again, because positive proof is not available, I can only offer you my own theories for your consideration.

Yet this in itself, he said, was not positive proof of a hoax.

People who experience positive social proof may also benefit from a halo effect.

The fact that attempts are made to restore it is positive proof.

"Science can give us no positive proof of its existence; it cannot be defined."