NCIS, Season 2

Abby:
There were traces of cocaine in the box.

McGee:
So Tony was right, he was dealing drugs.

Abby:
Maybe not, the traces were microscopic so it could just be from hiding money.

[McGee looks confused.]

Abby:
He calls himself a federal agent.

Gibbs:
U.S. money supply is contaminated with traces of cocaine.

McGee:
I thought that was an urban myth.

Abby:
Give me a bill.

McGee:
Huh?

Abby:
Give me a bill!

[McGee hands her a bill.]

Gibbs:
A hundred?

McGee:
Yeah, I like to be prepared for any emergency.

Abby:
You are such a boy scout.

[Abby rubs bill on paper.]

Abby:
Money is a great receptor because the ink never really dries. One bill used to snort cocaine then going through an ATM leaves minute traces of the drugs on thousands of others. Four out of five bills in circulation are contaminated to a level that can be detected by drug dogs.

[Abby goes back to work, without giving back the bill.]

McGee:
Um, Abs?

Abby:
Yeah?

McGee:
Forgetting something?

Abby:
No.