Defaults: Perception-6, Body Language-4, or Psychology-4.
Modifiers: +1 for Sensitive or +3 for Empathy, or -3 for Low Empathy; +4 if subject is Easy to Read.
Detect Lies (Per/Hard) is the skill to tell when someone is lying; though it is not the same as Interrogation.
B187
Additional Material[]
Oxhorn's play through of L.A. Noire gives examples of how Detect Lies works.