Okay, this is a jacket worn by our suspect Hector Rivera. We believe he stabbed Gabriel Cervantes, so I'm going to run what's called a Luminol test

What's Luminol?

Luminol is a compound that when it interacts with the iron and hemoglobin...uh, ..Luminol is a compound that when it interacts with the iron and hemoglobin, it will luminesse

You mean the blood?

Yeah, nothing vanishes without a trace, especially blood. Stabbings are very bloody, so if there is blood on this jacket, Luminol will cause it to glow

Oh cool!

Another word for it is evidence

Any way you can get that to be even brighter? I just want it to really pop on film

Sure, just give me a second

That's the money shot

Yeah, it's mine too. So we just have to get this over to the DNA lab, have them confirm it is our victim's blood, then...case closed

Hey Valera, what did you get from Hector's jacket?

Would you mind turning the camera off?

Come on, don't be shy. We're doing a pubic service

Seriously Ryan, turn it off

He's harmless. Don't worry about it

Okay, suit yourself. My results are zero, zip. There's no DNA on the jacket

I don't see how that's possible. The Luminol gave us significant blood spatter. It was actually more than significant

You should have seen it glow. It was amazing!

I bet it was. Problem is, the more Luminol you spray, the more you dilute the blood

Okay, alright, I get it. So what do we really got here?

Ryan....too much Luminol. There's no DNA!

If you want to get this guy, you're going to have to find some other way

You're going to have to get that thing out of my face...Get it out of my face!