Similar to the Missing Persons Investigations, the Watch Dogs Human Traffic Investigations can be completed if you wish to unlock the Magnate LE luxury car in the video game, and Revoking Client Privileges achievement/trophy.
The Human Traffic Investigations in Watch Dogs become available only later in the video game.
To unlock these side-missions, you have to complete Mission 12: A Risky Bid, featured in the second act. Once you finish A Risky Bid, you will be informed by a short message that the Human Traffic Investigations have been unlocked.
To unlock the corresponding achievement/trophy you need to finish all 11 Human Traffic Investigations.
Ten of them are short missions, which allow you to unlock the final investigation. A Human Traffic Investigation in Watch Dogs features three phases.
During the first phase you have to use Aidens profiler to identify specific citizens, known as Auction Bidders. In the second phase, you have to travel to the locations on your map, where you will find several briefcases containing money.
For the third and final phase, you have to hack the security system of the building where the briefcase is located, so you can scan the case. The Missing Persons Investigations take place in various districts, which means that you have to travel from one district to another; therefore, a good idea is to complete them after you unlock all of Aidens hideouts that allow you to fast travel.
Below is the complete guide for all Missing Persons Investigations in Watch Dogs.
The guide includes a series of maps showing their locations, as well as hints and tips that will eventually help you finish all of them and unlock all associated rewards.
Human Traffic Investigations Walkthrough
Watch Dogs Human Traffic Investigation 1 - Pawnee District
The first Human Traffic Investigation as revealed by the map below can be completed in Pawnee District. The Auction Bidder is Foydalem Gregory, and you will find him in a cemetery.
Use the profiler to hack his phone, and then press down on the D-Pad to place the waypoint that will lead you to the briefcase. Open your map and notice that the briefcase is located in Brandon Docks District.
Use the fast-travel option to get to the hideout in the eastern side of Brandon Docks, or drive to the location marked on the map. When you arrive look for a large building with a blue sign on it (Tidis).
Go around it and locate the security router on its wall. Hack it and solve the small puzzle to obtain access to one of the cameras inside the building. Now, scan the laptop near the brown boxes, and the briefcase near the blue trashcan.
Watch Dogs Human Traffic Investigation 2 - Parker Square
In Parker Square District you can complete two Human Traffic Investigations.
The first one is in the northern area, as marked below. The Auction Bidder is Chenkov Anton, and you can find him on a small terrace with yellow umbrellas.
Hack his phone, and then travel to The Wards District, very close to Aidens Hideout. Look for the security router, in front of the house, near a bush. Hack the router, and then hack the smartphone on top of the wardrobe, and the briefcase near the armchair.
Watch Dogs Human Traffic Investigation 3 - Parker Square District
For the second investigation in Parker Square, and the third in the videogame, visit the pier east from Aidens second hideout. The buyer, Henfield Paul Benedict is on the docks.
Hack his phone, then travel west from your current location and south from the second hideout. The security system is on the main street, on a building with white walls, near the entrance to a garage.
Hack it, and then hack the smartphone near the TV set and the briefcase on the floor.
Watch Dogs Human Traffic Investigation 4 - The Wards District
In The Wards District, east from the hideout is another Watch Dogs Human Traffic Investigation. The buyer is Barrthes Francis T, and you will find him in a backyard, if you follow the maps below.
Once you hack his phone you have to travel to Mad Mile, east from the hideout in the northern area. The security router is near a large building, in a passage.
Close to it, you should see a large poster showing a woman (Cold Fear). Hack the router before the time runs out, and then scan the briefcase near the desk, and the smartphone on the right side of the room, close to the window.
Watch Dogs Human Traffic Investigation 5 - Brandon Docks District
Brandon Docks includes two Human Traffic Investigations. The first one is on the northern island, where you will find Kramer Joshua in the shipyard.
After you hack his phone, you have to travel to The Loop District, south-west from the eastern hideout. The security router you have to hack is on an alley, close to a blocker.
Hack the router, followed by the smartphone on top of some books (left side), then scan the briefcase on the floor (right side).
Watch Dogs Human Traffic Investigation 6 - Brandon Docks District
In the eastern side of Brandon Docks, is the sixth Human Traffic Investigation. Once you reach the location marked on the map below, look for the buyer (Treaklesen, David R) on the docks, near a large ship.
After you hack his phone, you will have to travel to The Loop District, north-west from Tobias shop. The security router is located on a building, in an alley blocked by a barrier.
Notice the graffiti nearby. Hack the router, then scan the briefcase behind the brown couch, and hack the smartphone on the bookshelf.
Watch Dogs Human Traffic Investigation 7 - The Loop District
Two additional Watch Dogs Human Traffic Investigations can be completed in The Loop District.
Once you hack the ctOS Towers, open your map and notice that one of them is in the eastern side. To begin the investigation, find the auction bidder, Peccorino Adolpho C on a terrace, near an empty pool.
Hack his phone, then travel to The Wards and look for the router inside an alley that separates two buildings. Once you solve the small puzzle, hack the phone on the table, then scan the briefcase on the couch.
Watch Dogs Human Traffic Investigation 8 - The Loop District
On the western island of The Loop District is the eighth Human Traffic Investigation included in our Watch Dogs guide. In the location marked on the map is a small plaza where you will find Graften Martin.
After you hack his phone, you must travel to Mad Mile, west from Aidens hideout located in the eastern side of the district. Now, hack the router on the tall building, behind the green columns, then scan the briefcase on the chair, and hack the smartphone on the wardrobe.
Watch Dogs Human Traffic Investigation 9 - Mad Mile District
In the western area of Mad Mile District is the ninth Human Traffic Investigation in Watch Dogs. Locate Peaston Darius in the small park, by visiting the location on the map below, and hack his phone. To continue the investigation, travel to Parker Square, west from one of Aidens hideout.
The router is on the wall of a building, close to a music shop. Hack it, then hack the notebook computer on the couch and scan the briefcase on the floor (left side while facing the couch).
Watch Dogs Human Traffic Investigation 10 - Mad Mile District
The tenth Watch Dogs Human Traffic Investigation also takes place in The Loop District, but in the eastern side.
Visit the pier and find Breenwood Carl on a terrace in the small plaza. After you hack his phone, go back to the northern island in Brandon Docks and you will find the security router, at the bottom of some stairs, behind a fence.
Solve the puzzle, then scan the briefcase near the door and hack the notebook on the floor.
At this point, assuming that you have also played some of the main missions, you will hear Aiden informing you that the person responsible for all human traffic deals is Joseph Demarco,thus your final goal is to find him.
The last Human Traffic Investigation mission is in fact a criminal convoy side-mission, which takes place in The Loop District. Head to the location marked on your map, and start the final investigation.
After the small cutscene go around the building and look for a router near a tree. Once you hack it, turn the camera to the right and hack the phone of the corrupt police officer.
Now, you will have to intercept the convoy and kill Joseph Demarco. Get a car quickly, and head to the route marked on your map. Joseph Demarco is located in the second car, so block the street using your vehicle, and get out.
Take cover behind your car and kill all guards in the first car. Next, shoot down Joseph Demarco and escape the area.