CSI: Miami, Season 6

Delko:
Tim, it was you this morning [Speed shakes his head yes] It's been a long time.

Speedle:
Yes it has.

Delko:
Why are you here?

Speedle:
Well I figured you could use my help. I mean you always did, right?

Delko:
[laughs] Alright then help, what am I missing?

Speedle:
What's the first thing you learn on the job?

Delko:
How to pad your time card.

Speedle:
The second thing.

Delko:
Every person who enters a crime scene brings something in and takes something away.

Speedle:
Even before we call it a scene.

Delko:
What are you saying someone took evidence before we even arrived? [Speedle gives him a look] Then how do I find something that's not even here?

Speedle:
Just because you can't see something doesn't mean it's not there.