This is quoted from an U.S. TV series.
Warden: Brad.
Brad (Captain): Any updates?
Warden: None. They were last seen at that cemetery in Oswego.
Brad: They'll get them. They'll get them.
Warden: It's been handed over to the FBI.
Brad: Well, that doesn't mean we can't work it.
Warden: It does, actually. You and I have been pulled off the pursuit.
Brad: Why?
Warden: We're going to find out shortly. We have to report to the DOC headquarters. I will meet you there.
Brad: Sir, we can get these guys. Just give me a couple more days and I swear I'll get them.
Warden: Brad! We've got to go.
Best Answer
The 'it' refers to the case, the investigation. The FBI pulled rank and took the case away from them. Now it is out of Brad and Warden's jurisdiction. As Warden says, they have been pulled off the pursuit (case, investigation).
To answer the question, these two can no longer work the case, meaning they can't pursue the criminal or continue the investigation.