Dr. Richard Carmona, a 30-plus year veteran of the Pima County Sheriff's Department, says he was confident the FBI investigation would result in an indictment.
"We are very grateful to the FBI and the US Attorney for taking this case on. Because there's thousands of employees who are embarrassed by the activities of a few," said Carmona.
Carmona told KGUN9 the FBI questioned him and numerous staff about senior command, Deputy Chief Chris Radke -- who has now been indicted, Sheriff Chris Nanos and Chief of Staff Brad Gagnepain, who committed suicide a few months ago.
Carmona says more could be coming.
"This is a federal investigation and you know often they don't throw all the federal indictments together. They may do one. They may do another one next week. There may be one next month."
Or there could be plea bargains, he says.
"But what we do know is they've aggressively pursued this and followed the trail down to the top three."
Union president Sgt. Kevin Kubiskey, who says he's faced retaliation for being a whistleblower, is counting on the FBI to dig deeper.
"I encourage them to continue on with their investigation, which I know they're doing. I think you're going to see a lot more come from this than just one indictment," said Kubiskey.
Sheriff Nanos sent out the media release on the indictment and Radke's resignation late Monday night.
He wrote: there is a stringent process in place for RICO money expenditures and an audit on the backend. He wrote -- he would review all processes to make sure checks and balances are working appropriately.
But Carmona says Nanos should not be allowed to shift the blame.
"You're responsible for everything. Every procedure and if you don't make sure they're correct then you should be held accountable. And clearly, there's a gap here. A big gap. Especially when it results in an FBI investigation. because on your watch, all of these things occurred."
READ THE CHRIS RADTKE INDICTMENT BELOW: