Kensi tries to coax info out of an important prisoner right before he is mysteriously poisoned to death. It didn't work, but they got what they needed from him just the same.
(Hetty approaches Callen as he is sleeping, he wakes up staring at Hetty) Hetty: Did you catch him this time? You were twitching like a sleeping dog. Callen: Well, you now what they say about sleeping dogs. (looks at Hetty)