Butter substitutes are not allowed to be served in state prisons.

97.18(5)

(5) The serving of oleomargarine or margarine to students, patients or inmates of any state institutions as a substitute for table butter is prohibited, except that such substitution may be ordered by the institution superintendent when necessary for the health of a specific patient or inmate, if directed by the physician in charge of the patient or inmate.

97.18(6)

(6) Any person who violates any provision of this section may be fined not less than $100 nor more than $500 or imprisoned not more than 3 months or both; and for each subsequent offense may be fined not less than $500 nor more than $1,000 or imprisoned in the county jail not less than 6 months nor more than one year.