The Secretary shall sample, inspect, test, and make analyses of any commercial fertilizer and soil conditioner distributed in the State at any time and place and to an extent the Secretary considers necessary to assure compliance with the provisions of this subtitle. The Secretary shall adopt the methods of sampling and analysis from sources, such as the journal of the Association of Official Analytical Chemists, or methods that insure representative sampling and accurate examination. In determining for administrative purposes whether a commercial fertilizer or soil conditioner is deficient in any component, the Secretary shall be guided solely by the official sample obtained and analyzed as provided by this subtitle. The Secretary may enter any public or private premises, including any transportation vehicle, during regular business hours, to obtain access to commercial fertilizer or soil conditioners or to records relating to their distribution.