Once he arrived the leader told all the people the instructions. They would each be given a letter to deliver to the 20th floor. Then they warned them that under no circumstances may the letter be opened.
However, Jon was curious so he slipped into a hallway and opened the letter. This is what it said:
You have the qualities to be a police officer. Please deliver this letter to the third floor instead to begin your training.
Written by Skyrim90000