1. Which standard, among those currently in use at the circuit court
level, must be applied to determine whether a government attorney's violation of
the Jencks Act, 18 U.S.C. 3500, amounts to a prejudicial or harmless error?

2. Does the discretion afforded to district courts under the Federal Rules
of Evidence and Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993),
permit the exclusion of otherwise admissible expert testimony relating to a critical
issue where opposing expert testimony about the same issue has been admitted?

Which standard must be applied to determine whether a Jencks Act violation is prejudicial or harmless?