<Table> <Tr> <Td> </Td> <Td> This article is incomplete . Please help to improve it, or discuss the issue on the talk page . (April 2012) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article is incomplete . Please help to improve it, or discuss the issue on the talk page . (April 2012) </Td> </Tr> <P> The history of warning labels in the United States began in 1938 when the United States Congress passed a law mandating that food products have a list of ingredients on the label . </P>

When did they put warning labels on dip