We may never have evidence of the lab leak (assuming it happened, which is seeming increasingly likely). As the ex-head of MI6 recently commented China will have long since destroyed all the records and evidence at the lab.
However – we are receiving proofs by a roundabout way. The evidence of an organised cover-up is increasing. It is established that China has not been forthcoming with data and records from the Wuhan lab. One year + into a global epidemic and in the context of a WHO investigation. Come on! Plus the other material about false trails – the virus was transmitted into China on chilled food, the fictitious link to Pangolins which has failed to stand up.
This serious article by ex Nature editor Nicholas Wade asked the question about how much the US Chief Doctor Anthony Fauci knew about possible gain-of-function experiments at the Wuhan lab. He has denied that there were any – in work funded at the lab by the US NIH – but does this denial depend on semantics? Either way the NIH was funding the work of Shi Zheng-li (Dr. Bat) and if this irresponsibly conducted work (much of it was conducted in labs at a low level of security) did indeed lead to the pandemic then one can see why Dr Fauci might be part of the cover-up. Nicholas Wade characterises it amusingly:
One can imagine the behind-the-scenes conversation in which the Chinese government says, “If this research was so dangerous, why did you fund it, and on our territory too?” To which the US side might reply, “Looks like it was you who let it escape. But do we really need to have this discussion in public?”
It now turns out that in a private email Dr Fauci was keener on the lab leak theory than he has been in public. He was “not convinced” by the theory of transmission via an intermediary animal. A second email released under US FOI has been fully redacted according to the BBC.  What part of the truth concerning a global pandemic which has killed millions do the US authorities not want us to see? It is hardly a military secret. – It looks like Nicholas Wade’s amusing imaginative sketch is rather close to reality.
Today Dr Fauci is reported as saying: “I don’t remember what’s in that redacted [email], but the idea I think is quite far-fetched that the Chinese deliberately engineered something so that they could kill themselves as well as other people. I think that’s a bit far out.”
But. Hold on. This is not what people are saying. People are suggesting that the virus (already ready-to-go and attach with optimal efficiency to human respiratory tracts from the moment it started circulating in Wuhan) was released accidentally as part of research that Shi Zheng-li was doing into how to make coronaviruses more infectious. He must know she was doing precisely this work because it was funded by the NIH.  So – his denial is strange. Is he denying this charge about a deliberate bioweapon (which is a conspiracy theory) to avoid responding to the very much not a conspiracy theory – accidental leak from dangerous research funded by his organisation? Is it like his denial about “no gain of function experiments at Wuhan” – it is a game with words?
We may indeed never find the hard evidence that that the virus leaked from the Wuhan lab but the evidence of a cover-up – not just from the Chinese authorities – but also from the US Health establishment – is growing fast. And why cover up something which didn’t happen?