The strychnine had been found in a drawer in the prisoner's room. 
( ( The strychnine ) ( ( had ( been ( found ( in ( ( a drawer ) ( in ( ( the ( prisoner 's ) ) room ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN strychnine)) (VP (VBD had) (VP (VBN been) (VP (VBN found) (PP (IN in) (NP (NP (DT a) (NN drawer)) (PP (IN in) (NP (NP (DT the) (NN prisoner) (POS 's)) (NN room)))))))) (. .)))
The strychnine that was in the drawer was powdered. 
( ( ( The strychnine ) ( that ( was ( in ( the drawer ) ) ) ) ) ( ( was powdered ) . ) )
(ROOT (S (NP (NP (DT The) (NN strychnine)) (SBAR (WHNP (WDT that)) (S (VP (VBD was) (PP (IN in) (NP (DT the) (NN drawer))))))) (VP (VBD was) (ADJP (JJ powdered))) (. .)))