I really miss the show Lie to Me. Chap named Cal Lightman (played brilliantly by Tim Ross) is a lie expert. He reads what are called microexpressions in the human face, and can determine whether or not a person is telling the truth. (Based on real science, pioneered by Paul Ekman, the reality is not quite as TV crime show, but is never the less fascinating.)
In the first episode he hires a TSA inspector named Ria Torres. An abusive childhood has taught her to read facial expressions. She is what Lightman calls a natural.
Although the occasional scene where Ria catches something Lightman misses is injected for humorous effect, the dynamic of their relationship is very much mentor and apprentice. Even as a natural, it is assumed that she will expand her knowledge, understanding, abilities through training and experience.