Getting Perfect Inspection in Quarantine Zone: The Last Check isn’t mandatory to complete the game, but hitting the mark for every survivor will make things a lot easier.
A Perfect Investigation, in simple words, means that you get the best rating on an inspection. Naturally, it has its own set of rewards: 9 RP and extra cash. So let’s look at how you can ace every investigation.
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How to get Perfect Investigation in Quarantine Zone: The Last Check
Quarantine Zone: The Last Check doesn’t clearly explain how to obtain a Perfect Investigation. The process gets more complex once you unlock advanced tools.
Look at every nook and corner
A good inspection is always a thorough one. You’ll want to scan a person for any symptoms thoroughly. If you have the scanner, scan him from the sides, front, and back. Similarly, use the hammer on all four limbs (usually, a couple of limbs should work, but why take the risk of missing out on bonus rewards).
Log the symptoms

Yes, logging symptoms manually becomes boring. The list goes up the more you play. However, you’ll want to stay vigilant and log all the symptoms manually. While you can occasionally miss one here and there, don’t rely on this. You’ll also want to use the lab efficiently to detect new symptoms.
Seize the correct contraband

It’s important to seize illegal items that survivors might want to carry with them inside the outpost. Allowing that to happen can be extremely dangerous, and removing them will help you get extra cash. However, don’t seize any item that’s not supposed to be taken. This will not only reduce your cash balance, but it will also reduce the rating of your inspection.
Quarantine when unsure

I have tested this ample times: liquidating a survivor who wasn’t infected with the undead virus will always lead you to getting a poor inspection. If you’re unsure, don’t liquidate the person. Instead, send them to the Quarantine, and wait to find out if they’re indeed infected or not.
That’s just how simple it is to get a Perfect Investigation every time a survivor comes to your outpost. Don’t forget to use the advanced tools, and take time with everyone, and you’ll soon be getting plenty of extra Research Points and cash to improve your base and tools.