Many questions from WHO press conference on origins of pandemic, especially related to level of investigation at labs. Did they just ask questions + accept answers? Any in-depth scrutiny of records? How do they know protocols were followed?
https://www.wsj.com/articles/coronavirus-most-likely-spilled-over-to-humans-through-intermediate-animal-says-who-11612868217

Here in the US, @CDC's BSL-4 and high containment labs have excellent protocols too. But the policies and procedures that are on paper are not always what actually happens at even the best labs. One example of how labs get lucky. https://www.usatoday.com/story/news/2015/02/04/cdc-releases-ebola-lab-incident-report/22754861/

Lab workers and scientists are human. They make mistakes. They sometimes get sloppy. Or they badly misjudge the effectiveness of their procedures. https://www.usatoday.com/story/news/2015/09/17/dugway-lab-anthrax-test-tube/32555249/