Sheep Raid NPR's Jon Hamilton reports on today's seizure of a flock of Vermont sheep that some suspect may have been in contact with mad cow disease. The owners of the flock maintain that the sheep do not have the disease and have not been exposed to it. Nevertheless, federal officials arrived at the farm today and removed the sheep. The flock was quarantined in 1998 after being imported from Belgium. Federal offiicials maintain that the sheep ate contaminated feed while there. Since then, the Agriculture Department says tests show four sheep have a form of disease related to mad cow.