WASHINGTON (AP) -- The Colgate-Palmolive Co. said Thursday that 5-ounce tubes of counterfeit toothpaste sold in discount stores in four states under a Colgate label are being recalled because they may contain a poisonous chemical. A Food and Drug Administration official, Doug Arbesfeld, said Wednesday that testing had found the chemical in a product with the Colgate label, but said in the initial announcement that the FDA was unsure whether it really was Colgate or a counterfeit.