MADISON, Wis. (AP) -- Wisconsin dairy farmers who believe they have found a way to legally sell raw milk in the state will make their case in court on Tuesday.

The operators of Grassway Organic Farm in Calumet County allege in a case before a Dane County judge that the state has no right to stop them from selling milk to customers who have become part-owners of the farm.

The case isn't a direct challenge to Wisconsin's ban on raw milk sales, but if Kay and Wayne Craig prevail, it would open up a loophole large enough to drive a herd of dairy cows through.

The Craigs' lawsuit is one of two in the court system over the state law banning all but incidental sales of raw milk. Another one involves Walworth County farm Nourished by Nature.