The USA has 76 percent of the world\'s serial killers.
Thousands of serial rapists and sexual murderers have disclosed tricks of the trade to Criminal profilers.
This face-to-face research continues today.
This information formed the basis of a new field of study called behavioral profiling.
The FBI agents from Quantico gained valuable insights into a predator\'s mindset.
During the 1980s, FBI special agents traveled around the country to conduct death row interviews with 198 of them.
The USA has 76 percent of the world\'s serial killers