Hypothetically, say where it was is some place where there were people walking. I'm pretty sure your crime scene is contaminated. I know it hurts to hear that but I wouldn't want you accusing someone of something horrible because you found a trace of them there. That'd be horrible of me.

[ There's a bit of a pause here where, had this been video, Edgeworth would have seen Tony's eyebrow go up. ]

To my knowledge, someone might have. I know I didn't, but that's about it. As for the luminol, really?