Actually used them on an enemy in combat, or as a utility tool?
Agreed!
As a further question for anyone with knowledge on the subject: What type of ammo do LEOs use in AR's if their department allows them to have one in their vehicle? Personal choice or is there some type of restriction?
The Closest you will find is In the Hague Convention;
Section II, Chapter 1, Art 23, (e) [FONT="]To employ arms, projectiles, or material calculated to cause unnecessary suffering;
[/FONT]and as you noted it is, vague.
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And the only reason that this is in there is because the Germans had a propaganda field day lamenting how the British were mercilessly maiming the poor Mahdists during the Battle of Omdurman with "Dum-Dum" bullets. The U.S. did not support this section as we were using them in the Phillipines
The Contracting Parties agree to abstain from the use of bullets which expand or flatten easily in the human body, such as bullets with a hard envelope which does not entirely cover the core, or is pierced with incisions.
The present Declaration is only binding for the Contracting Powers in the case of a war between two or more of them.
It shall cease to be binding from the time when, in a war between the Contracting Parties, one of the belligerents is joined by a non-Contracting Power.
IMO, we abide by it, even though we are not bound, primarily for PR purposes.
Best,
Joe