> Meaning if they don't got the result they want, they will discard the study and you will never hear about it. Drug studies can be fudged this way.
You picked exactly that one field of science where this can't happen. At least in the EU (and US, according to Wikipedia), clinical trials have to be registered before conducting the actual research, so they can't be discarded if not successful.
This is sort of true, sort of not. The primary investigator who registers a clinical trial is obligated to report the results back to the registry. But if they get a negative result, they are still going to have a hard time finding a decent scientific journal that's willing to publish it. And an unpublished result isn't going to have nearly the visibility that a published result does.
You picked exactly that one field of science where this can't happen. At least in the EU (and US, according to Wikipedia), clinical trials have to be registered before conducting the actual research, so they can't be discarded if not successful.