I've been looking into the research that was going on at the Wuhan Institute of Virology. There is an NIH grant that was doing interesting research around bat coronavirus. https://scholar.google.com/scholar?q=R01AI110964&hl=en&as_sd... . I would encourage you to read into their research methods. This one is pretty scary in retrospect https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7089274/pdf/114.... Research methods included synthesizing new Coronavirus variants with specific genes. It's not a smoking gun but it's definitely a loaded gun.