Dr Raoult was very vocal in France about hydroxychloroquine as a treatment for covid 19. https://en.wikipedia.org/wiki/Didier_Raoult

It seems today that he was just wrong and used to make "dubious" clinical trials.

> As of 2025, 46 of Raoult's research publications have been retracted, and at least another 218 of his publications have received an expression of concern from their publishers, due to questions related to ethics approval for his studies.