The guard's announcement made everyone attention went to the poison expert. The one coming was an old man wearing simple grey clothes. He had his white hair tied up in a ponytail. On his right hand, there was a brown old box while his left hand brought nothing.
The old man had a kind, gentle face. He looked like general people who worked in the medical field.
"That is old Zhu, the famous poison expert that saves the empress life years ago?" One of the younger generation with quite a knowledge immediately recognised the old man. He turned out to be the same person involved in the previous poisoning case!
He could be seen as the empress' life saviour so everyone believed him. The man himself was famous to be upright and honest. There's no way he could be bribed to lie or trick someone with his words.