While this policy is not defined in any written terms & conditions anywhere, there have been plenty of approval and denial data points that serve as empirical proof of the rule. (pointsyak.com)
I actually have a lot of empirical proof in the restored quality of life in my clients, but so much of what I do is discovered through subjective means. (nakedpastor.com)
But no one had empirical proof because gamma - ray bursts are so fleeting and difficult to pinpoint. (discovermagazine.com)