the mysterious truth

Witnesses appearing in court will be told how serious it is to tell the truth. And they will be sworned in by the court to tell the truth, nothing but the truth. Then there are witnesses who have been given friendly advises by their good friends to tell the truth. Some even have emissaries to remind them to tell the truth. Anyone being reminded over and over again can be expected to tell the truth. What happens if the truth is so confusing and contradictory that it gave the impression that the truth teller is coming through as either a knave or a fool? Is simple truth so confusing? Or confusion and contradiction is what truth is all about? Under such circumstances, shall one examine the truthfulness of the truth of the soundness of the witness?