Take the following as truth: He clutched Poirot by the arm, and sank his voice to a whisper: "Just tell me this, Mr. Poirot, it isn't, it isn't strychnine, is it?" I hardly heard what Poirot replied. 
Then the following statement: "He wanted to make sure that someone thought about strychnine." is true, false, or inconclusive?
Answer: Inconclusive