 Though this defensive loophole slightly narrows the types of cases which may be prosecuted for perjury, the effect of this statutory defense is to promote a truthful retelling of facts by witnesses, thus helping to ensure the reliability of American court proceedings just as broadened perjury statutes aimed to do.Subornation of perjury stands as a subset of US perjury laws and prohibits an individual from inducing another to commit perjury.Subornation of perjury entails equivalent possible punishments as perjury on the federal level.