Several people have pointed to the story of Dr. Frances Kelsey, a pharmacology researcher in the US Food and Drug Administration who insisted on reliable evidence on the safety of Thalidomide, which turned out to be causing severe birth defects. Here's a great version of the story shared by npub1ukthtfmtrxff0788ve525qeddmhppeelswtvzdaeka6fqxn4qm8s0pdyq4 (npub1ukt…dyq4)
https://www.theglobeandmail.com/news/national/one-canadian-doctor-kept-thalidomides-harm-from-america/article34961202/