Unlocking the challenging 'Public Bathrooms' achievement in the Forensic M.E. Protocol case requires you to connect all five pieces of evidence to the correct suspect, Elias Thorne, without using any in-game hints from your AI assistant, SAM. This is a test of pure deductive reasoning, and even a single request for help will instantly void the achievement for your current playthrough. This guide provides the complete, hint-free solution.
The case revolves around the apparent accidental death of a data courier in a high-traffic transit station bathroom. Your initial assessment suggests a system malfunction, but a closer look reveals a meticulously planned execution. Successfully closing this case without assistance not only nets you the achievement but also provides crucial backstory on the game's main antagonist faction.
The Crime Scene: All 5 Evidence Locations
The entire case takes place within the sterile, white-tiled confines of the public bathroom at the Metro-Crosstown Station. The key is to be methodical. The game allows you to investigate objects in any order, but following this sequence ensures you build a logical chain of evidence, making the final accusation straightforward.
1. The Encrypted Datachip
Immediately to your left upon entering, look inside the third stall. The victim is slumped against the wall, but the crucial piece of evidence is not on their person. Activate your augmented reality (AR) overlay and scan the floor near the sanitation drain. Tucked almost completely out of sight is a small, silver datachip. Its casing is cracked, but the memory core is intact. This is your starting point. Tagging it logs Evidence #PA-771 into your case file.
2. The Synthetic Fiber
Move to the bank of sinks opposite the stalls. Between the second and third basin, a single, dark blue fiber is snagged on the water activation sensor. To a normal observer, it's nothing. To your M.E. Protocol scanner, it's a critical clue. This fiber doesn't match the victim's clothing or any standard-issue civilian apparel. Its unusual polymer composition suggests specialized industrial wear. Tag it as Evidence #PA-772.
Annotated diagram of the Forensic M.E. Protocol public bathrooms achievement case crime scene.
3. The Modified Cleaning Drone
In the back corner of the bathroom, a maintenance closet stands slightly ajar. Open it. Inside, you'll find a standard custodial drone, but a quick scan reveals it's been illegally modified. Someone bypassed its safety protocols and jury-rigged a high-intensity laser coagulator to its chassis — a tool used for instantly sealing pipes, but deadly at close range. The drone's internal logs have been wiped, which is itself suspicious. This is your murder weapon. Tag it as Evidence #PA-773.
4. The Vic-Chip Residue
Return to the victim's body. Your initial scan likely cleared them of external trauma, but the real damage is neurological. Switch your scanner to Bio-Resonance Mode and focus on the victim's temple, just below their Vic-Chip implant. You'll detect a faint, localized energy residue consistent with a targeted EMP burst, fried from the inside out. This explains the cause of death and links it to an electronic weapon.
5. The Security Footage Anomaly
Finally, interact with the security camera mounted above the main entrance. The footage appears clean, showing the victim entering and no one else following. This is the puzzle. Don't take it at face value. Access the camera's maintenance logs through your interface. You'll find a record of a remote 'de-rez' command issued exactly 92 seconds before the victim's time of death. This command temporarily pixelates a specific zone of the camera's feed—a technique used by high-level hackers to move undetected. The de-rez zone was centered on the maintenance closet.
Connecting the Dots: Analysis and Deduction
Finding the evidence is only half the battle. Now you must link it all to one of the three potential suspects presented in your case file: Elias Thorne (a disgruntled ex-corp engineer), Jena Oris (a rival data courier), or the station's AI Warden (a possible malfunction). Here is the correct analytical path.
Infographic showing the analysis steps for the synthetic fiber evidence.
Cross-Referencing the Evidence
Your main tool here is the Chronos Database in your evidence screen. You need to create logical pairings to build the case against Thorne.
-
Fiber and Suspect: First, analyze the Synthetic Fiber (PA-772). The lab report will identify it as 'CX-9 Ballistic Weave', a material used exclusively in private engineering workshops. Cross-reference this material with the suspect profiles. Only Elias Thorne has a registered workshop and a background in materials science.
-
Drone and Engineer: Next, analyze the Modified Cleaning Drone (PA-773). The report on the laser coagulator will note its sloppy, non-standard integration. This wasn't a military-grade weapon; it was an industrial tool turned into one. This methodology perfectly matches Thorne's profile as a brilliant but disgraced engineer known for improvising tech.
-
Datachip and Motive: Now, run decryption on the Encrypted Datachip (PA-771). The partial data you can recover contains schematics for a corporate espionage device. Cross-referencing the schematics against Thorne's employment history reveals they are identical to a project he was fired for trying to sell on the black market. The victim was likely Thorne's courier, and Thorne was tying up a loose end.
-
Footage and Alibi: Finally, the Security Footage Anomaly provides the method. The remote 'de-rez' command required a high-privilege access key. Thorne, as a former station engineer, had his access keys revoked, but the logs show the command was routed through a legacy network he helped design. He knew the backdoors. This dismantles his alibi that he was miles away, as the attack was remote.
With these four links established, you have a complete chain: Thorne had the motive (silence the courier), the means (modified drone), and the opportunity (remote access to station systems). The fiber places a piece of his workshop gear at the scene.
The Final Accusation: How to Avoid Failure
The most common failure point is jumping to conclusions or using the in-game hint system, SAM. Before you make your final accusation, double-check that you have manually linked all the relevant evidence in your case file menu. A green link icon should appear between each piece of evidence and Thorne's profile.
When you are ready, approach the case summary terminal and select 'Accuse Suspect'. Choose Elias Thorne. You will then be prompted to present the three most critical pieces of evidence.
- Motive: Present the Encrypted Datachip (PA-771).
- Means: Present the Modified Cleaning Drone (PA-773).
- Opportunity: Present the Security Footage Anomaly.
Submitting this sequence will trigger the case-closed cinematic, where Agent Redox lays out the proof. Thorne is apprehended, and the 'Public Bathrooms' achievement will pop on screen. Using SAM to ask "What's the motive?" or "How was the drone used?" will provide you the answer but will lock you out of the achievement.
Comic grid showing the consequence of using a hint versus not.
FAQ for the Public Bathrooms Case
Can you get the 'Public Bathrooms' achievement on any difficulty? Yes, the achievement is tied to your actions within the case, not the overall game difficulty. It is obtainable on Easy, Normal, or Hard mode, as long as you do not use the hint system.
What happens if you accuse the wrong suspect? If you accuse Jena Oris or the AI Warden, Agent Redox will present the flawed evidence, and your commanding officer will override your conclusion. The case will be marked as 'Closed - Unresolved', and you will be locked out of the achievement for that playthrough. You would need to reload a save from before the accusation or restart the chapter.
Do you need to find the evidence in a specific order? No, the evidence can be discovered in any order. However, the logical flow presented in this guide (Datachip -> Fiber -> Drone -> Residue -> Footage) helps in building the narrative of the crime, which can make the deduction process more intuitive.
Is it possible to miss any of the evidence permanently? You cannot permanently miss any of the five required pieces of evidence. The game will not allow you to leave the bathroom crime scene until you have tagged all five clues. The challenge isn't in finding them, but in correctly interpreting them without help.
A Clean Flush
The 'Public Bathrooms' case is a microcosm of FORENSIC - M.E. Protocol's design philosophy. It's not about action or reflexes but about careful observation and logical linkage. By resisting the urge to ask for help and trusting your own deductive process, you prove your mastery of the game's core mechanics. Follow this guide, and you'll add one of the game's more satisfying achievements to your collection.