Restaurant owners in New York State are being warned to keep their used cooking oil locked up by the New York State Police. Troopers are responding to incidents involving used cooking oilAccording to a post on their website, the New York State Police have had to respond to several incidents involving suspects who are siphoning used cooking oil from restaurant storage tanks. They have found people using hoses and connecting them to the used cooking containers and pumping the oil into their own vehicle. Why are people stealing used cooking oil? At least three people have been arrested in New York State this month for stealing oil.