Okla. Stat. tit. 57 § 218
The Department of Corrections may contract with any requesting public agency to provide inmate labor for public works projects. The Department of Corrections shall promulgate and adopt rules which may require the requesting agency for the public works project to pay up to the base cost plus ten percent (10%), on a monthly billing. The rules shall provide guidelines which establish the criteria for how said charges are determined and the amounts the agencies are to be charged. The requesting agency shall furnish all tools and materials, unless otherwise agreed upon, necessary in the performance of said public works project. The prisoner, while assigned on said public works project, shall, for the purpose of punishment for escape, be deemed to be on a trusty status and shall be under the custody and control of the Department of Corrections.
Okla. Stat. tit. 57, § 218