Most experienced prosecutors, judges, and defense attorneys would probably agree that perjury in the criminal justice system occurs often. Although the frequency of perjury has never empirically been demonstrated, it is not surprising that with so much at stake, prosecution and defense witnesses would be tempted to fabricate testimony to meet the exigencies of the case. Detecting and dealing with perjurious testimony, however, is another matter. Implicated are complex legal and ethical problems for both prosecutors and defense attorneys. The judiciary's response to these problems, moreover, has largely been formalistic, without enunciating sufficiently clear standards to guide future behavior.
Bennett L. Gershman, Reflections on Client Perjury, N.Y. St. B.J., Oct. 1987 at 30, http://digitalcommons.pace.edu/lawfaculty/625/.