[unspun]

some good double-blind experiments

Yes, those tests have been done and haven't proven very fruitful overall (although, some if I recall right, have had some 'positives'). The problem is that these tend to be rare events. There are purportedly recurring events though, with some individuals. That is the kind of thing that Sheldrake tests.

[js1138]

Ah, the rare even excuse. Somehow physics manages to deal with rare events in a manner that doesn't encourage fraud. The really disturbing thing about these phenomena is that their frequency is inversely proportional to the care taken by the experimenter.