Iowa Code
Chapter 201A - AGRICULTURAL LIMING MATERIAL
Section 201A.7 - Toxic materials prohibited.

201A.7 Toxic materials prohibited.
A person shall not sell, offer for sale, or expose for sale agricultural liming material which includes material which is toxic to plants, animals, human, or aquatic life, or which causes soil or water contamination, as provided by rules adopted by the department.
96 Acts, ch 1096, §9, 15