CSI: Crime Scene Investigation, Season 6

Warrick [to Catherine]:
You rang?

Catherine:
I got the DNA results from the blood on Hannah's sweater.

Warrick:
Stacy?

Catherine:
Hannah.

Warrick:
So, she fabricated evidence and put her own blood on the shirt.

Catherine:
Maybe, maybe not. I mean, the soil on the shirt was consistent with the dump site. Hannah could have been at the scene. She could have cut herself burying the body.

Warrick:
Or she could have gone back to the field any time in the last four months and rubbed her shirt in the same kind of dirt.

Catherine:
And counted on us to make the match? [Warrick shrugs] Well, that's just plain scary smart. I mean, my daughter is a few years older than her and the most important thing on her mind right now is how much belly-button to show off at the mall...I never thought I'd be grateful for that.