Malcolm blinks. "Holy shit." The fact that Connor is able to do that is amazing. Malcolm wishes that he could do it, if it wasn't so gross.

"It's not uncommon for perpetrators to accidentally cut themselves when they're stabbing someone else," Malcolm says. He's fascinated now. "No databases, but maybe you can tell me something about the blood? Blood type?" Then he has another idea. "If you tasted the blood of a suspect, would you be able to match it to that blood?"

Connor is a walking DNA test.