(a) In order to provide a form of compensation by the state to innocent victims of criminal trespass in violation of Code Section 16-7-21 or criminal damage to property in the second degree in violation of Code Section 16-7-23, either of which crime involved the unlawful placement of graffiti upon private property by a person who was not the owner of such property, the Board of Corrections or any political subdivision of this state may authorize the use of labor by inmates from any penal institution or jail under its authority to remove or obliterate such unlawfully placed graffiti when such graffiti is visible from any public road or other public property. Any such authorization and related supervision of inmates shall be a discretionary function within the meaning of paragraph (2) of Code Section 50-21-24 for purposes of sovereign immunity, and the sovereign immunity of neither the state nor any political subdivision thereof is waived for any loss arising out of such authorization or related supervision of inmates. The Board of Corrections shall provide rules and regulations governing such use of labor by inmates from institutions under its jurisdiction.(b) No graffiti removal program operated by any political subdivision of this state shall charge any fee to any property owner or operator for removal of graffiti from such property.