Evidence/article on it here:
https://thebulletin.org/2014/03/threatened-pandemics-and-lab...
Not only that, but just last year there was a case of a Chinese scientist who was banished from a Canadian bio lab level 4 for stealing virus samples, as well as a Harvard Academic found to be taking money from the Chinese gov to help develop the lab in Wuhan.
None of this proves the lab theory, but I do believe that with enough genetic analysis the truth will come out.