The director may appoint qualified personnel to enforce the provisions of the Nebraska Soil and Plant Analysis Laboratory Act and any duly authorized representative of the director may at any reasonable time enter any laboratory for the purpose of reviewing qualifications of personnel, for examination of equipment in use for soil and plant analysis, and for inspection of the laboratory facilities, methods, and procedures. Every laboratory shall be inspected at least once every two years. It shall be unlawful to hinder, impede, or prevent entry by the director or his or her authorized representatives for the performance of their duties.