A Georgia food processor linked to a deadly salmonella outbreak shipped thousands of pounds of peanut products after learning its products were contaminated and cheated on testing, a former plant manager testified this week. Samuel Lightsey is a key government witness against his former boss, Peanut Corporation of America owner Stewart Parnell, and two others. He described documents to jurors that show Peanut Corporation shipped peanuts to companies in Missouri, Illinois and other points after receiving laboratory warnings that product samples had tested positive for salmonella. In other instances, the company cheated on safety testing by switching samples, Lightsey said.