(S (S (NP (BASENP (DT A) (JJ female) (NN friend)) (SBAR (WHNP (WP who)) (S (VP (VP (VBD was) (PP (IN with) (BASENP (NNP Owens)))) (BASENP (JJ last) (NN night)))))) (VP (VBD observed) (S (BASENP (PRP him)) (VP (VP (VBG taking) (BASENP (JJ several) (NN prescription) (NN pain) (NNS killers))) (CC and) (VP (VBG behaving) (ADVP (RB erratically))))))) (PERIOD .))