What is the difference between a Deputy Sheriff working in the jail and a correctional officer? I know that the deputy sheriff has gone to a P.O.S.T. academy, but I am asking job wise what the difference is? The correctional officer academy at the local community college is like 4-weeks long, and the police academy is about 6 months long, so I figured there must be a difference between the jobs they both do. I live in California by the way, so I realize that the length of the academies vary by state.