Empathy (GURPS) is one of Fallout GURPS advantages. See: Fallout GURPS.
You have a feeling for people. When you first meet someone, or when you are reunited after an absence, you may request the GM to roll against your IQ. He will then tell you what you feel about that person. (A failed roll means the GM may lie to you.) This talent, when it works, is excellent for spotting imposters, ghostly possession, and the like, and determining the true loyalties of NPCs. You can also use it to determine whether someone is lying . . . not what the truth really is, but just whether they are being honest with you.”— Steve Jackson Games GURPS sources