Mich. Comp. Laws § 286.342

Sec. 2. Growers of fruit may submit to any temporary chemical laboratory samples of fruit for analyses for spray residue in order to determine the conditions that prevail as a result of spraying practices, upon the payment of a reasonable fee for each sample submitted. The results of the analyses of such samples from individuals, corporations or firms shall be reported direct to the grower or parties submitting the samples but in no case shall a certificate be issued on a lot of fruit as a result of the submission of informative samples by individuals.