http://en.wikipedia.org/wiki/National_Center_for_the_Analysis_of_Violent_Crime
-This is an elite investigative branch that investigates all crimes and is run by the Behavioral Science Unit
-The mission of the NCAVC is to coordinate investigative and operational support functions, criminological research, and training in order to aid local, federal, state and foreign law enforcement.
-The kinds of cases they handle include unusual/repetitive violent crimes(serial crimes). They also investigate matters such as national security, corruption, white collar crimes.
-Typical cases for these guys include child abduction or mysterious disappearance of children, serail murders, single homicides, serial rapes, extortions, threats, kidnappings, product tampering, arsons and bombings, weapons of mass destruction, public corruption, domestic/international terrorism.
