NCIS: Los Angeles2009

Nate Getz:
This first address. That was the first address he was sent to. He was 5 years old. I really can't understand why they would separate him from his sister. Each address is entered chronologically, all by the same person.

Henrietta 'Hetty' Lange:
Why is that surprising?

Nate Getz:
It's an aging hand, Hetty. Different pens, different pencils. These addresses weren't all added at the same time, but as they happened. Every time Callen moved, the same person wrote down the new address.

Henrietta 'Hetty' Lange:
You're saying someone - someone was watching Callen all those years?

Nate Getz:
The same person.