No ethical constraints exist regarding providing printed materials to attorneys or in carrying out certain tests or evaluations. However, problems begin to arise when the expert is invited to strategy sessions, asked to help impeach experts for the other side, or asked to sit with the attorney and help in the cross-examination of other experts. Thus, experts must constantly assess their role with the case and its personnel and must ensure absolute objectivity while on the witness stand. Another possible solution to the ethical dilemma is to have one expert as a consultant and another as the witness. Careful attention to the ethical issues involved will prevent bias on the witness stand.