SDCL § 38-19A-9: Proof required of claims or usefulness and value--Evidence of proof.

The secretary of agriculture and natural resources may require proof of claims made for any soil amendment. If no claim is made, he may, nevertheless, require proof of usefulness and value as a soil amendment. For evidence of proof the secretary may rely on experimental data, evaluations, or advice supplied from the agricultural experiment station. The experimental results shall be applicable to such regional conditions as to which the product is intended. The secretary may accept other sources of proof as additional evidence in evaluating soil amendments.