(S (S (BASENP (NN Key) (NN evidence)) (VP (VBZ includes) (NP (BASENP (NN video) (NN footage)) (CC and) (NP (BASENP (NN testimony)) (PP (IN from) (NP (BASENP (JJ veterinary) (NNS surgeons)) (COMMA ,) (SBAR (WHNP (WP who)) (S (VP (VP (VBD were) (ADJP (JJ present))) (SBAR (WHADVP (WRB when)) (S (BASENP (NNS police)) (VP (VBD raided) (NP (BASENP (JJ several) (NNS locations)) (VP (VBN suspected) (S (VP (TO to) (VP (VB be) (VP (VBN involved))))))))))))))))))) (PERIOD .))