This was a reasonable burden based on the familiar principle that it's fair to call on the side asserting a proposition to offer persuasive proof of it.

He found that there is no persuasive proof that the methods used by fingerprint analysts have been adequately tested in objective, controlled experiments.

No persuasive proof was given of money, weaponry, or training being provided.

Yet skepticism warred with the persuasive proof Burke offered.

Then Mr. Branstad, who is not running for re-election, offered some persuasive proof.

Petrie suspected that the many subsidiary graves were sacrificial burials, but found no persuasive proof, and so he turned his attention to more inviting sites.

The bloodstained knife discovered on Nelson, which should have provided persuasive proof in support of the prosecution's case, was not properly handled.

Its satiric plot turns on the consternation caused by the discovery of a new and overwhelmingly persuasive proof for the existence of God.

Observations by the two scientists furnished indirect but persuasive proof of the existence of gravity waves, which have long been postulated but never directly observed.

Is there persuasive scientific proof that barefoot running is a more "natural" way to run, will reduce the chances of injury, and may well make you faster?