(S (S (NP (BASENP (DT An) (JJR earlier) (NN report)) (PP (IN by) (BASENP (DT the) (NNP Associated) (NNP Press)))) (VP (VBD had) (VP (VBN said) (SBAR (S (BASENP (NNS tests)) (VP (VBD had) (VP (VBN found) (SBAR (S (BASENP (DT the) (NN substance)) (VP (MD might) (VP (VB be) (BASENP (NN ricin))))))))))))) (PERIOD .))