The South Lake Tahoe Police Department is looking for a man they believe has been contaminating food at the Raley’s grocery store on Lake Tahoe Boulevard. Police say surveillance video shows a man walking into the store, and putting an unknown type of substance on top of the food in the food court. Police believe this person has done this at least three other times since November 8th. Authorities have sent the contaminated food to a laboratory to find out what the substance is and are awaiting results. The suspect as white, about 5 feet, 7 inches tall with a thin build. He was last seen wearing a black hat, and dark sunglasses.