Legal Question in Administrative Law in District of Columbia

The courts and jury are to evaluate the credibility of a witness based on the totality of their testimony. You could argue that a witnesses entire testimony is not credible and should be disregarded because they obviously lied about one part of their testimony. The factfinder, however, is under no obligation to disregard all of the testimony. If the testimony is extremely important to the issue before the court, you should make the argument that the witnesses testimony is unreliable due to his/her inability to tell the truth.