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But it is non-trivial to impossible for them to prove it wasn’t. Which is perfect for political tools and wedges.

Ok. But I'm saying it's almost impossible that no one knows, as the parent comment suggests.

Edit: my original comment was not intended to be a reply to you, but to the parent.

Ah, fair. If it was a lab leak, it is likely someone, or many people, know. I doubt any of them have any incentives to share that information.