were not granted access to enter. the w.h.o. scientists were allowed in. their conclusion is that it is very likely that it spread naturally from the animals, and that a lab leak was unlikely. >> there is no evidence of that at all, but it is something that we did look honest and frank and informative. >> reporter: but that is the substance of the investigation, which relied on the conversations with the chinese scientists and taking them at their word. some experts say that china hask bloed them from data, and others have been critized for their connection to the lab, and helping to fund the lab. and this scientist is quickly to