Sheesh! to quote StLkEr222 (Mind if I call you Johnson?):

"Arbitrators

Yautja police that mainly consist of ANCIENTS who are bored with the Hunt. They represent judge, jury, and executioner. There are no appeals to their decisions."

However bear in mind that those are fan made guesses. If you want to see their ranks, and are too lazy to look around a bit (Not flaming, I'm just saying. Heck, I sometimes feel too lazy) then here are all the ranks: http://en.wikipedia.org/wiki/Yautja#Ranks

Also, in my post I said that " Arbitaters could be the ones that aren't in some way impaired (Illness, left arm blown off, no face, ect)"

Meaning that we could have seen an Arbitater at the end of Predator 2 and AvP


Stupidity works in mysterious ways. Its greatest achievement is solar-powered night-vision goggles.

Yeah true but there is info on other websites about the ranks really close too this.

"Give me a hand with this Haverson, this thing weighs more than your last date." Sgt. Johnson,
HALO: FIRST STRIKE