@PierreCol i was in a bioinformatics class once that told the cautionary tale of a PhD who faked an entire dissertation to get a degree. problem was someone came along later to tried to put it to use, and found that absolutely nothing in the paper worked. then people started digging and found his entire career was a hoax.
you should trust very few people regardless. and they have to earn it. just having the paper doesn't cut it. a lot of shit tier doctors have M.D.s afterall