Starting skills:
Awareness, Common Lore (Adeptus Arbites, Underworld),Inquiry or Interrogation, Intimidate, Scrutiny
Starting talents:
Weapon Training (Shock or Solid Projectile)
Starting equipment
Shotgun or shock maul, Enforcer light carapace armour or carapace chestplate, 3 doses of stimm,
manacles, 12 lho sticks
Background bonus:
The Face of the Law: An Arbitrator can re-roll any Intimidation and Interrogation test, and can substitute his Willpower bonus for his degrees of success on these tests.
Background aptitude:
Offence or Defence
Ignis Aeternus WH 40K campaign notes 