Bio-security refers to the policies, and measures taken, for protecting a nation's food supply and agricultural resources from both accidental contamination and deliberate attacks of "bio-terrorism." Now viewed as an emerging threat, bio-terrorism might include such acts as introducing pests intended to kill U.S. food crops; spreading a virulent disease among animal production facilities; and poisoning water, food, and blood supplies. The federal government is now increasing its efforts to improve bio-security because of the recognition that the United States is currently vulnerable, both from a civil and military standpoint.