Separation of military and police roles
The separation of military and police roles is the principle by which the military and law enforcement perform clearly differentiated duties and do not interfere with each other's areas of discipline. Whereas the military's purpose is to fight wars, law enforcement is meant to enforce domestic law. Neither is trained specifically to do the other's job. Military and law enforcement differ, sometimes fundamentally, in areas such as source of authority, training in use of force, training in investigation and prosecution, and training in enforcing laws and ensuring civil liberties. : 3 Even "gray area" threats like drug trafficking, organized crime or terrorism will require sophisticated investigative skills and adherence to procedures for building a case as well as close collaboration with prosecutorial and judicial authorities.