(10) To develop an official waterfowl stamp for the State of Georgia and to issue such stamp to any interested person and to contract with any person granting such person the right to reproduce and market the official waterfowl stamp in stamp, print, poster, or such other form as the department shall determine and to contract with any person for the purpose of promoting, supporting, or otherwise assisting any waterfowl program of the department, including, but not limited to, public education; research; acquisition of wetlands; and management, development, and protection of waterfowl programs; provided, however, that not more than 15 percent of the funds retained by the department, if any, shall be used for law enforcement activities. The department is authorized to establish a special fund to be known as the "Waterfowl Stamp Fund." This fund shall consist of all moneys paid to the department as royalties, all moneys derived from the sale of any official waterfowl stamp, and all moneys contributed to the fund for the purposes provided in this paragraph and all interest thereon. All balances in the fund shall be deposited in an interest-bearing account identifying the fund and shall be carried forward each year so that no part thereof may be deposited in the general treasury. The department shall administer the fund and may expend moneys held in the fund in furtherance of the purposes provided in this paragraph. Moneys paid into this fund shall be deemed supplemental to and shall in no way supplant funding that would otherwise be appropriate for these purposes. As used in this paragraph, the term "waterfowl" means any species of ducks, swans, or geese.