Su Qing didn't understand any of the professional knowledge. Frankly speaking, his understanding of the forensic profession was limited to TV and movies, pretty much like the post-op instructions from the doctor who circumcised Lao A: don't touch with your hands directly.
After all, corpses, especially those in such an advanced stage of decomposition, are harmful to people, but that's about it.
As for finding clues on a corpse, what the heck is that? If it weren't for the narration, he wouldn't even be able to distinguish the corpse's gender, let alone find clues.
Of course, the two clues he mentioned were the only ones he could talk about right now; guessing that the corpse was decomposed was one thing, but seeing axe chop marks on the bones was real, and he said he saw it. No one could question that. But if he were to reveal the dead person's identity and home address, then things would escalate.
