The board of trustees of a school district is encouraged to establish and maintain a firearms safety education course for primary and secondary school students. The trustees may adopt an elective course of instruction developed by the department of fish and game, a law enforcement agency, or a national firearms association as its firearms safety education course. Instructors from the department of fish and game, a law enforcement agency or a national firearms association, or a person recognized by the trustees as having expertise in firearms safety education may provide the course instruction.