system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40K] How do I know an Inquisitor isn't a foul cultist with a stolen rosette?

So I'm a small business owner - couple thousand employees stamping out rations for the local Imperial Guard regiment through the Departmento Munitorum. We've had Chaos issues in a neighbouring city, and after it was burned to the ground I got the feeling attention was being paid to ours. Sure enough, one of my men -ex-refugee from said city- asked for a private word and presented the Rosette. He demanded I add a chemical he provided to the rations I supplied, that would paralyse the IG once consumed (literally, he said it was derived from a venom). I knew better than to question him, but after our...chat, I wondered. 

The Inquisition has no ruling body, no guard stations, no HQ for me to ask. The rosette was genuine, but anyone could have picked it up from a fallen Inquisitor, maybe even centuries ago, and nobody would be the wiser. Inquisitors clash with cultists all the time, it stands to reason some could be struck down, and their badge used to corruption and chaos. Emperor, what shall I *do?*
gpt
You have two options here.

You can tell the highest figure of Imperial authority you can get access to (for someone of your station, probably a Munitorium officer or Arbites Precint-Captain) and let them take it up the chain of command.

If you're lucky, it will either get lost in the paperwork shuffle as it grinds its way up the chain of command or take so long that you, your children, and your children's children have long gone to the Emperor's side. 

If you're very, very unlucky it will get expedited - or catch the attention of one of the Inquisition's countless spies - and you'll soon have the dread Inquisition breathing down your neck. 

If you're unluckier yet, you did in fact give poison to an impostor and the investigating agents will decide "better safe than sorry," especially with the troubles in your region, and you will be *thoroughly* interrogated and executed, your family and employees will disappear, and your existence will be wiped from all records aside from whichever secret libraries contain whichever fell tomes in which the Inquisition lists the names of thrice-damned traitors. 

If you're the unluckiest Emperor-forsaken son of a Grox in the Segmentum, you obeyed the order of a genuine Inquisitor. You will, at the very best, have the suspicion of the scariest and most powerful agents of the Emperor trained against you and your house for centuries; at worst, you will be punished for questioning the Left Hand of the Emperor and publicizing the activities of His most secretive servants.

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Or, you could keep your damn head down and mouth shut, lie through your teeth about a bad batch further up the supply chain from you, and pray to your Emperor that you did the right thing - or did the wrong thing, and fell through the cracks.