Police have arrested four people accused of selling drugs while at work.
The Grant County sheriff says managers at the Dana plant, in Dry Ridge, asked them for help in May, thinking some of their employees were dealing drugs.
A deputy then went to work undercover at the plant, as a janitor.
The sheriff says that deputy quickly saw some troubling things.
"He was recognizing that employees were using drugs on break," Grant County Sheriff Chuck Dills said. "And he proceeded then to document and build a case to make those drug buys."
Early Monday morning, Grant County deputies arrested three men and one woman, and charged them with drug trafficking in this case.
The sheriff says the Dana plant cooperated fully with this investigation.
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