Board Thread:Warhammer 40k General Discussion/@comment-24505078-20140427055850/@comment-6078851-20140427145310

from what i understand of the arbites they're imperium sanctioned police tasked with keeping planetary civilians under the yoke of imperial law. they're more about day-to-day law-abiding so if things like cultists or invasions occur then the militery is called in - guard, inquisition, marines.