Iowa Code § 200.16: “Stop sale” orders.

The secretary may issue and enforce a written or printed “stop sale, use or removal” order to the owner or custodian of any lot of commercial fertilizer or beneficial substance, if the secretary finds the commercial fertilizer or beneficial substance is being offered or exposed for sale in violation of any of the provisions of this chapter including any rule adopted under this chapter. The secretary may hold the commercial fertilizer or beneficial substance at a designated place until the law has been complied with and the commercial fertilizer or beneficial substance is released in writing by the secretary, or the violation has been otherwise legally disposed of by written authority, and all costs and expenses incurred in connection with the withdrawal have been paid.