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Since they are investigators, its probably some kind of multi-media recording device... a holo-cam maybe. So when they walk into a supposed crime scene, they just look around and record things.

Their surgical gown uniform might also be designed to reduce their contamination of any scene as well.

"combination cop, super-spy, lawer..."

Wherever the Civilization Compact has been violated, or is thought to have been violated, they go in with gusto. Like UN Weapons Inspectors... only with authority.