" The difficulty for prosecutors was that, unlike defense attorneys, we had to actually believe the theory we were arguing to the jury. Defense attorneys have an obligation to argue their clients' version of the facts or any alternate version of the facts that benefit their client. Their subjective belief in the truth of the version must be disregarded unless there is clear evidence that perjury has been committed. Prosecutors, however, can proceed only if they have a good-faith belief that the prosecution is warranted and that the material evidence on which it is based is true. "

― , Imperfect Justice: Prosecuting Casey Anthony