Documentary filmmaker David Osit was going down an internet rabbit hole in the late 2010s when he stumbled upon a primitive, yet quickly addictive, message board. Sporting the archaic look of a Web 1.0 site that time forgot, the still-active board, called “The Temple of TCAP,” featured sections with names like “Murder Police Interrogations” and “Re-Offenders.” Osit wasn’t a true-crime guy, even if a lot of the job offers he was getting were in the genre, given the public’s seemingly limitless appetite for it. Yet he found himself poring over criminal depositions, FOIA requests, and raw video footage of a TV series he used to watch regularly, but hadn’t seen in more than a decade: To Catch a Predator .

A Dateline NBC segment that ran from 2004 to 2007 and became a cultural juggernaut,

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