Isn't that just the police?
FBI almost always have a criminology or psychology degree and know way before applying to the FBI that the test doesn't work.
But the type of person to join the FBI would 100% Google it first and read studies. At least wikipedia.
Jocks go CIA, nerds go FBI.
It's not as true as it used to be, especially with so many new agencies over the last 20 years, but it's generally true.
FBI has much stricter rules of engagement...
The CIA operates abroad and historically can do whatever they want including but not limited to full on government coups.
But yeah, since 9/11 we've got like 3x the security agencies. People can go anywhere now