It was commonly called the Star of Roshan. It was the grass that he chewed while he was moving all the way from the cave to the temple. It was the flower that she separated the leaves from and threw away. It was the poisonous plant that should not be used without permission, often called scopolia japonica because animals could eat it by mistake and run wild.
"… This was the cause of the accident."
"Yes. I think someone fed the horses this on purpose. It's not the type type of grass that horsemen can mix in the feed by mistake. Not only the horsemen, but also the servants who work in the stable know how dangerous this grass is to horses."
"Did you say Barton brought it to you?"
"Yes. I made sure he would not leak it to anybody else. I told him to report to me first about any other evidence he finds."
"What is the probability that Barton stole the show to put himself in the clear after he had caused the accident?" he asked calmly.
"Well… I can't rule out that possibility, but…"