Rex Heuermann spent years studying serial killers, criminal profiling, and the FBI's investigative methods. Now, as part of his guilty plea, he has agreed to be interviewed by the FBI's Behavioral Analysis Unit. In this episode, host Josh Zeman explores what investigators hope to learn, why Heuermann agreed to cooperate, and whether a man who spent decades deceiving everyone around him can be trusted to tell the truth. Featuring former FBI profiler Mark Safarik, former NYPD commander Joe Giacalone, and former Suffolk County Police Commissioner Rodney Harrison.