The liquid in the cup is close if not exatly like that of the liquid found in the barons wound.
"Sir please put the masters cup down," Jeffery says to Purelius noticing his nervousness, "Why don't you walk outside and get Dig so we can question him? It should be tending the roses out back."
"Poison what posion???!?!" He seems shocked and appalled at the thought.
"No... no sir, I was not first as I stated before. M' lady was first here I was third with the maid being the only one who beat me here to see what was going on. No one touched anything, they were too shocked. He was sprawled in his chair neck sliced open bruises all over his body, but I assume you knew that much."
About Dig:
"Dig is, what do they call themsleves now, a WAR-FOR-GED. Yeah that is it he is a warforged left over from the great war. M' lady employs him because he does good work, but I don't like em."
[sblock=wmasters] Tori begins to walk around the room looking for something. Search 22 vs DC 20 Success. Near the window, behind the curtain, you find a pair of humanoid foot prints. They seem to have a almost deep impression to them like who ever it was was standing there for quite some time. Sense Motive 17 vs DC 0 Success. As far as you can tell Jeffery is genuinely shocked to hear about posion, and also seems to be telling the truth about the evenings events.[/sblock]