(a) In addition to any powers heretofore granted, the Commissioner shall have the authority to:

(1) Inspect all agricultural products coming into Georgia markets or offered for sale within the state;

(2) Prescribe and collect reasonable fees and charges to pay the necessary costs of operating and maintaining farmers' markets; and

(3) Assign space on farmers' markets and make changes in such assignments as circumstances may require.

(b) Nothing contained in this article shall be construed to limit any power or duty conferred upon the Commissioner by existing law.