Mich. Comp. Laws § 290.358
The state board of agriculture, by any duly authorized agent, may take from any bundle of galvanized wire fence so tagged and labeled and which is being offered for sale in this state, a sample of such fence not exceeding 12 inches in length, the same to be measured along the length of the fencing and comprise the whole width thereof, such sample to be kept by said state board of agriculture and tested for the purpose of ascertaining whether the manufacturer or dealer has complied with the terms of this act: Provided, That in making all tests or measurements for the purpose of ascertaining whether or not such fence is inferior grade or gauge to that specified on the tags or labels thereof, the state board of agriculture, by its duly authorized agent or agents, shall select 5 separate samples of such fence from 5 separate bundles thereof, and if, after applying the standard gauge and test prescribed by this act, 3 or more of such samples shall not equal the gauge and grade indicated on such tags or labels, then such fence from which the 5 samples were taken shall be deemed to be of inferior gauge or grade as the case may be.
MCL 290.358