YSF156, the main sources of info are Phase 3 trials for Pfizer and Moderna. They seem to be run by strict protocols and involve a lot of research personnel. Interestingly, both trials have very similar profiles of results. Are you aware of any concerns related to such trials? Maybe you want to review the results and protocols and see what could be a problem there.
I suggest also look at AstroZenica trials – they seemed to present slightly biased results: one sub-group had 50% first dose due to false double-measuring, and they did not fully explain it first and tried to combine results of two sub-groups – and seem to be delayed by months. I did not look into details, but this is evidence that someone is watching for bad results.