Iowa Code § 214A.22: Department inspection — samples tested.

The department shall, from time to time, make or cause to be made tests of any motor fuel or biofuel which is being sold, or held or offered for sale within this state. A departmental inspector may enter upon the premises of a dealer and take from any container a sample of the motor fuel or biofuel, not to exceed one gallon. The sample shall be sealed and appropriately marked or labeled by the inspector and delivered to the department. The department shall make, or cause to be made, complete analyses or tests of the motor fuel or biofuel by the methods specified in section 214A.2.