There is no confusion in the truth

When you tell the truth, even ten years from now you can
say the same thing and it sticks, when you lie it's hard
because our brain does not recognize the "event" as what
had really happen. To find out if a person lies, ask them the same thing a week or two after, and be sure to write down what they had said before, you may be surprised, truth
is truth, theres no "other verson".