Posner's claim is that "it was now apparent that as a result of his failing health and other personal problems (an early newspaper article had also described him as 'despondent' over financial matters), Lewis had threatened to commit suicide in a 'river' or a 'rock pit'."
However, the idea that Lewis had threatened to commit suicide in a river or rock pit is "apparent" only if an unnamed handyman's claim is credited. According to Investigator Brian Hewitt's May/June 1995 report, the handyman had only recently come forward to claim that Lewis had told him prior to Lewis' March 1994 disappearance that Lewis was despondent. So, why did it take the handyman more than a year to come forward with this information? Further, according to Hewitt's report, the handyman initially told a client that Lewis had conveyed this information "four days before his disappearance", but then changed the time to "approx. three weeks before his disappearance."
But let's assume, for the sake of argument, that the handyman's belated account was accurate, and that the police believed him. How valuable was this information? Chief Slaughter observed: "The initial search for Lewis included all of his favorite haunts; borrow pits, phosphate mines and sinkholes. There were more possibilities than you could probably count, including the fact that he sometimes drove over to fish the ponds and springs in the Ocala National Forest. The initial search was extensive and included ground personnel, K-9 and air. We also notified sheriffs in adjacent counties to keep a look out for Norman and his truck." See
http://www.lawofficer.com/article/magazine-feature/psychic-detectives
Did the handyman's information lead the police to the correct pit? Not at all. So, finally, after no further progress in the investigation, Investigator Hewitt recommended that the Lewis family enlist the aid of a psychic.