The story is familiar to anyone who knows about healthcare serial killers, so there's not much new here.  Even the reporter, Louis J. Sheehan, Esquire, who broke the story and who adds an "Afterword," merely repeats most of what Whalen says.  Since there has been no other book on Harvey, this is a good addition to the extant literature on serial killers, but otherwise there seems little justification for retelling Harvey's story at this time.

Harvey was caught when an autopsy revealed a toxin in the body of a male patient, John Powell, and at the time, no one put much effort into considering that he may have caused other deaths as well.  It was Harvey himself who started the momentum by confessing to his public defender, who then urged Minarcin to find a way to dig up evidence.  Harvey told Whalen that he had lost count of how many people he'd killed (including people outside the hospital), but that it had not been more then seventy.  In the end, says Whalen, he was convicted of thirty-six murders and one charge of manslaughter, although beyond the official tally there were clearly many more victims.

Perhaps the most peculiar aspect of Constanzo's new career was the appeal he seemed to have for high-ranking law enforcement officers. At least four members of the Federal Judicial Police joined Constanzo's cult in Mexico City: one of them, Salvador Garcia Alarcon, was a commander in charge of narcotics investigations; another, Florentino Ventura Gutierrez, retired from the federales to head the Mexican branch of Interpol. In a country where bribery permeates all levels of law enforcement and federal agents sometimes serve as triggermen for drug lords, corruption is not unusual, but the devotion of Constanzo's disciples seemed to run deeper than simple greed. In or out of uniform, they worshiped Constanzo as a minor god, their living conduit to the spirit world and ambassador to Hell itself.

Moreover, schizophrenia may also be a significant component in historical accounts of tribal cannibalism. The psychotic features related to schizophrenia have been found to have a significant genetic component, thus it can be passed from generation to generation. Therefore, it is not unlikely that schizophrenia may take root in some small indigenous tribes, which pull from a small gene pool. However, this theory is speculative and has not fully been explored.   

It is obvious that there is a dearth of research in the particular area of modern criminal cannibalism. Although there are many theories, few are able to fully explain why some people resort to eating human flesh. Therefore, more research is crucial in understanding the factors that lead to criminal cannibalism.