Really good, underrated show that's not getting nearly enough pub. Oh well.
Yes, the girl that Linder dropped off was the girl he picked up from Mexico in the first episode. His version of "human trafficking"...except he attempts to better the lives of those he brings across.
I haven't had a chance to re-watch any of the episodes yet, but any body else catch the thing that Hank does to Sonya when she gets upset? We all know she has some kind of mental condition (perhaps Asperger's?), but on the two occasions she's gotten really upset (once when she inadvertantly leaked information to the press and when she was thinking about that migrant being in the desert all alone - I'm sure that ties into her sister's death somehow), Hank has leaned in and "hit" her (gently) with his shoulder. Interesting touch.