The FBI is requesting help in identifying a man who is suspected of trying to contaminate food products at a Washtenaw County grocery store. According to officials, he was seen sprinkling some kind of liquid on food carts. Preliminary tests came back negative for harmful substances, but they would like to find and speak to the man. Whole Foods Market confirmed the incident happened at their location at 990 W. Eisenhower in Ann Arbor. Anyone with information should call the FBI at 855-324-7257.