Behavioral Science Unit

The Behavioral Science Unit (BSU) was an FBI division created in 1972 within the FBI Training Division at the FBI Academy in Quantico, Virginia, to apply social science research and behavioral analysis to criminal investigations, particularly violent crimes.

The BSU became internationally known for developing criminal profiling techniques and conducting research into the psychology and behavior patterns of serial killers, rapists, and other violent offenders. Agents from the unit interviewed incarcerated criminals to understand their motivations, methods, and psychological characteristics, creating databases and analytical frameworks that could be applied to unsolved cases. This work formed the foundation of modern criminal profiling and investigative psychology.

The unit provided operational support to federal, state, and local law enforcement agencies investigating complex violent crimes. BSU analysts would review case materials, crime scene photographs, and victimology to develop offender profiles and investigative strategies. The unit also trained law enforcement personnel in behavioral analysis techniques and conducted research that contributed to the field of forensic psychology.

Through subsequent FBI organizational restructuring, the BSU evolved into what is now known as the Behavioral Analysis Unit (BAU), which continues the work of behavioral-based investigative support. The BSU designation represents a specific historical period in the development of criminal profiling within the FBI, roughly spanning from the early 1970s through the late 1990s. The unit's work during this period has been extensively documented in true crime literature and popular media, though such portrayals often dramatize the actual investigative processes.