Jones: Putting it in a spoiler tag in case someone want to watch it without knowing in advance.
[spoiler]
Do a wiki search for Thomas Quick (I think he goes by the name of Sture Bergwall nowadays). Short version is that he was a drug addict who confessed to 30-something murders in exchange for psychiatric medication. They doped him up to his eyeballs on benzodiazepine to get him to talk. They put him in the care of this psychologist, who legit turned out to be the informal leader of what can best be described as a cult within the judicial system, and she got him to 'recall' repressed memories of childhood trauma. He fabled something together that sounded straight out of a particularly bad Criminal Minds episode, and they took it and ran with it. The more he talked the more drugs he got.
Countless of politicians, policemen, prosecutors and judges, including the former Chancellor of Justice, built their careers off the back of this case. Which was well embarrassing when Quick withdrew his confessions a couple years later. At that point they started to use their positions to protect their own interests and make sure his case didn't get retried. It took six years to get him fully acquitted despite the fact that there wasn't a single witness or piece of forensic evidence to tie him to any of the crimes.[/spoiler]