In forensics, it a person that can prove any claim with some obscure piece of evidence. Evidence hounds are characterized by spending countless hours on the internet amassing information and evidence on debate resolutions. Evidence hounds are especially found within the realm of Policy Debate.
Girl 1: "Wow, Rab just proved that Jesus was black. He must be an evidence hound."
Girl 2: "Yeah...I just creamed myself while listening to him spew out all that evidence."