Just finished a docuseries called "The Confession Killer". Henry Lee Lucas was known as America's most prolific serial killer, admitting to hundreds of murders. A local sheriff and the Texas Rangers get him to admit to a bunch of murders. He admits to any they present to him. Then they reach out to agencies around the country and it grows. When they present several murders to the Waco District Attorney, he looks at the evidence and decides not to pursue because things don't add up. Reporters catch on and people realize the sheriff and Rangers are spoon feeding Lucas all the information about each murder and he's going along with it since he knows he's not going free. One set of parents don't believe he killed their daughter and do their own leg work. They find out Lucas wasn't even in Texas when she was killed. Law enforcement ignores the evidence and presses on. Rangers go after Waco DA to keep from looking bad as he's exposing one of the biggest criminal justice hoax in U.S. history. Making of a Murderer is small potatoes compared to this.
Also recommend the movie Last Flag Flying with Brian Cranston, Steve Correll and Lawrence Fishburne.