Lying, and Making Stuff Up

If the facts and circumstances of the key concession are as reported in the Castro case, then how can the confession — adduced after six hours of interrogation and Detective Larson “lying about evidence” and using clearly manipulative psychological techniques — be viewed as anything other than an involuntary/false confession? And what is wrong with our criminal justice system if, as law professor and forensic psychologist Dr. Leo is stating, “They present evidence, which can be real or made up. It’s perfectly legal for police to concoct a ‘ruse,'” i.e. a strategy of lying about evidence? How sick is that?