He did not find anything weird on him, so Han Sen chose to ignore it. He was trying to remember The Story of Genes.
In the past, Han Sen relied solely on his own power until he remembered everything that man had said. It was like he had copied and pasted the words into his mind. He did not really research the meaning behind his words though.
Now that he did start thinking about it, he realized The Story of Genes the Dao student mentioned had a lot of mistakes in it. A lot of what he said was about the research, involved predictions, and so on.
Han Sen read it all at once and realized the student did not actually study The Story of Genes. If he had studied it, the mistakes would not have existed. Han Sen believed it was just a research paper and not really a bunch of statements that came through via someone practicing the skill.