Sgt. Jason Vance, 31, has been arrested for felony theft.
The investigation started after Lower Buckeye Jail supervisors noticed a large sum of money was missing from a safe during a routine cash count.
Detectives examined surveillance video from inside the jail, which showed Vance taking the money from the safe while on-duty. They interviewed him and Vance openly confessed to the crime, MCSO says.
They say that Vance knew he was in the view of the cameras and tried to conceal what he was doing.
Sheriff Joe Arpaio says, "It is a very sad situation to have to arrest one of my own officers but this is a clear act of a crime and he must be held accountable."
Apparently Vance hadn't been working a lot lately and was in bad financial shape. His car was repossessed from the Lower Buckeye Jail parking lot.
"He was on leave without pay for 6 weeks so evidently he needed money to get his car back, but you don't go steal money from a safe to get your car back," says Sheriff Joe.
The safe holds cash brought in by inmates or deposited by their families while they are in custody.