Caudill told investigators that he was transporting the marijuana to an inmate in exchange for money.
He pleaded guilty on Thursday to one count of conveying prohibited items into a detention facility.
On April 15, Caudill, while working as a corrections officer at the prison outside Lebanon, entered the grounds with a package of marijuana wrapped in duct tape.
Staff conducted a random search of employees as they were entering work that day. Caudill removed the package from his bag and dropped it on the ground. Other employees witnessed this and reported it.
“We have a significant problem with drugs getting into our prisons. It’s bad enough when family and friends of the inmates sneak them in. But when individuals who we trust to maintain the safety and security in our prisons illegally convey drugs to the inmates—we have zero tolerance for that,” Warren County Prosecutor David P. Fornshell said in the release.