The Law Enforcement personnel's job is literally - to enforce the Law. While a soldier has the authority to kill, a civilian should protect only himself and a 3rd party protector is responsible for guarding his client; a Law Enforcer protects the Law.
Law Enforcement Krav Maga provides the trainee with techniques for controlling your opponent, rather than killing him, or retreating without harm.
Krav Maga is a flexible tool, and it can be modified to fit each country's set of laws. In democratic countries a Law Enforcer is presented with a problem - he must enforce the law and protect the civilians, whilst using a restraint amount of force. This is done with classifying violence into levels of threats: from the highest level (Firearms), through the moderate levels (knives and Shocker), and to the lower levels (Krav Maga empty-handed combat and voice control).
Since Law Enforcers are equipped with specific tools and weapons, Law Enforcement Krav Maga teaches them how to maximize the efficiency of these tools to fulfill their mission in the best way possible. (i.e. learn how to use handcuffs efficiently, learn how to use your pistol as a cold weapon, when you don't want or you cannot fire).
Law Enforcement Organizations prefer to teach Krav Maga, because it grants trainees four important elements: