There's more to being a cop than knowing how to fire a gun. Rockstar's enigmatic police adventure L.A. Noire touches on the finer nuances of police work, including the art of interrogation. A sharp mind is just as important as a sharp aim.
Interrogation sequences are an excellent example of how Rockstar further pushes the line between art and real life. Sitting across from a suspect, the player must observe and analyze his (or her) behavior, then determine when and how hard to push. Asking the wrong questions or accusing the wrong suspect of a crime might cost you valuable time and evidence, so take it nice and smooth.
All are innocent until proven guilty.