Originally Posted by
[M] Rubeus Hagrid
I investigated Voldemort... well, because it was late, I was tired, and he was on my suspicious list from the day before due to how he was acting. Once I actually thought it through, I was kicking myself. I did not investigate Snape because I felt there was easily enough to demonstrate why we should lynch him... which, apparently there was.
Notice how I mentioned Voldemort as suspicious (after Hermione) the day before I investigated him, and then after that didn't mention him at all. His investigation had cleared him.