The owner or principal operator of a convenience business or convenience businesses shall provide proper robbery deterrence and safety training by an approved curriculum to its retail employees within 60 days of employment. Existing retail employees shall receive training within 6 months of April 8, 1992. A proposed curriculum shall be submitted in writing to the Attorney General with an administrative fee not to exceed $100. The Attorney General shall review and approve or disapprove the curriculum in writing within 60 days after receipt. The state shall have no liability for approving or disapproving a training curriculum under this section. Approval shall be given to a curriculum which trains and familiarizes retail employees with the security principles, devices, and measures required by s. 812.173. Disapproval of a curriculum shall be subject to the provisions of chapter 120. No person shall be liable for ordinary negligence due to implementing an approved curriculum if the training was actually provided. A curriculum shall be submitted for reapproval biennially with an administrative fee not to exceed $100. Any curriculum approved by the Attorney General since September 1990 shall be subject to reapproval 2 years from the anniversary of initial approval and biennially thereafter.