He's not the Un-Sub. He was the partner, but look at how Slade s...
Dr. Reid: He's not the Un-Sub. He was the partner, but look at how Slade said "All the LoSeRs in this godforsaken school." That capitalization isn't an accident. "L, S, R" Louis Stuart Ramsey.
Agent Prentiss: So Slade named his own partner.
Reid: Ironically, Louis' marijuana addiction saved his life.
Prentiss: Well that puts us back to our original problem. If the Un-Sub wasn't the partner how did he get his hands on a list that Slade and Louis kept to themselves?