Unless one is in a technologically backwards society, perhaps the use of lie detector equipment and sensors skill.
perhaps after the use of the medic skill and administering truth drug
Be careful. This is an instance where players knowing the results of rolls can effect things.
Know you rolled low, then the player, not the character, realizes they need to press on with the interrogation to get accurate results vs The GM having the character think the suspect is telling the truth or perhaps having the character think the suspect is lying when they really did tell the truth.