In what circumstances will a defendant be allowed to cross-examine the results of a polygraph?

MultiRegion, United States of America

The following excerpt is from U.S. v. Wills, 88 F.3d 704 (9th Cir. 1996):

We addressed a similar contention in United States v. Lopez, 885 F.2d 1428, 1437-38 (9th Cir.1989), cert. denied, 493 U.S. 1032, 110 S.Ct. 748, 107 L.Ed.2d 765 (1990). In Lopez, the defense attempted on cross-examination to elicit an admission from a government witness that he became upset when learning that one of the defendants had taken and passed a polygraph examination. Id. Sustaining the Government's objection, the district court refused to allow inquiry into the circumstances surrounding the polygraph. Id. We held that the district court's restrictions on cross-examination regarding the results of polygraph examinations did not violate the defendant's Sixth Amendment confrontation rights:

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