That drawer was an unlocked one, as he had pointed out, and he submitted that there was no evidence to prove that it was the prisoner who had concealed the poison there. 
( ( ( ( ( ( That drawer ) ( ( ( was ( an ( unlocked one ) ) ) , ) ( as ( he ( had ( pointed out ) ) ) ) ) ) , ) and ) ( he ( submitted ( that ( there ( was ( no ( evidence ( to ( prove ( that ( it ( was ( ( the prisoner ) ( who ( had ( ( concealed ( the poison ) ) there ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT That) (NN drawer)) (VP (VBD was) (NP (DT an) (JJ unlocked) (NN one)) (, ,) (SBAR (IN as) (S (NP (PRP he)) (VP (VBD had) (VP (VBN pointed) (PRT (RP out)))))))) (, ,) (CC and) (S (NP (PRP he)) (VP (VBD submitted) (SBAR (IN that) (S (NP (EX there)) (VP (VBD was) (NP (DT no) (NN evidence) (S (VP (TO to) (VP (VB prove) (SBAR (IN that) (S (NP (PRP it)) (VP (VBD was) (NP (NP (DT the) (NN prisoner)) (SBAR (WHNP (WP who)) (S (VP (VBD had) (VP (VBN concealed) (NP (DT the) (NN poison)) (ADVP (RB there))))))))))))))))))) (. .)))
All evidence pointed towards the prisoner being the one to try and hide poison in the drawer.
( ( All evidence ) ( ( ( pointed ( towards ( the prisoner ) ) ) ( being ( the ( one ( to ( ( ( try and ) hide ) ( poison ( in ( the drawer ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT All) (NN evidence)) (VP (VBD pointed) (PP (IN towards) (NP (DT the) (NN prisoner))) (S (VP (VBG being) (NP (DT the) (NN one) (S (VP (TO to) (VP (VB try) (CC and) (VB hide) (NP (NP (NN poison)) (PP (IN in) (NP (DT the) (NN drawer))))))))))) (. .)))