Rodenticides are chemical substances used for the control of rodents such as mice and rats. Most act as anticoagulants, preventing blood from clotting and causing death from internal bleeding; examples include bromadiolone, chlorophacinone, and cholecalciferol. Some are used for rodent control in food preparation and storage areas, where strict placement rules keep baits away from food and food-contact surfaces. Their use in food premises demands trained operators, secure bait stations, and records, since misuse could contaminate products. Their use in food premises demands trained operators, secure bait stations, and records, since misuse could contaminate products and endanger non-target animals.