The Valuable Art Unit
The FBI has specific people employed for their valuable art unit. These people work on cases of stolen art and are qualified to identify fakes. They're also involved with black market exchanges to track items that have gone missing. Since 2004, they've recovered over 2,600 items of art. They totaled more than $150 million! Pieces of Picasso and Rembrandt are included in that number.
Secret Languages
It only makes sense that the FBI has a secret language! They have a universal lingo that they use in order to communicate with each other quickly and effectively. These are usually spoken over the radio or on the scene. This is another thing that prospective FBI agents have to do in order to prove that they have what it takes to become an agent.