>Proving something safe before use is not an unusual burden,
Surely it is an impossible one? It would require proof that the item will not cause harm - and that requires the proof of a negative.
I would submit that all that can be demonstrated is that, with the current state of our knowledge, we know of no reason to suspect that the 'something' will cause harm.
Best wishes
Peter
52°14'44.44"N, 1°50'35"W
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