There should be a grace period (perhaps 7 to 14 days long) given to all people in legal proceedings in which they would be allowed to change their answers to any question with only half the penalty that would be applied after the grace period expired. This may also apply to people questioned by police. After the grace period expires, any lies would submit the liars to the full force of legal punishment. This grace period, however, cannot extend beyond the close of a trial.