(S (S (BASENP (DT This) (NN legislation)) (VP (VP (VP (VBZ is) (PP (IN in) (BASENP (NN place)))) (S (VP (TO to) (VP (VB provide) (VP (BASENP (NN protection)) (PP (TO to) (BASENP (NNS witnesses)))))))) (PP (IN on) (NP (BASENP (DT the) (NN basis)) (SBAR (IN that) (S (PP (IN without) (BASENP (PRP it))) (S (BASENP (PRP they)) (VP (MD may) (VP (VB be) (ADJP (ADJP (RBR less) (JJ likely)) (S (VP (TO to) (VP (VB cooperate) (PP (IN with) (BASENP (JJ investigational) (NNS procedures)))))))))))))))) (PERIOD .))