| 3. Witnesses; discovery. All witnesses must be sworn. Sworn |
written evidence may not be admitted unless the author is |
available for cross-examination or subject to subpoena; except |
that sworn statements by a medical doctor or osteopathic |
physician relating to medical questions, by a psychologist |
relating to psychological questions or, by a chiropractor |
relating to chiropractic questions, by a certified nurse |
practitioner who qualifies as an advanced practice registered |
nurse relating to advanced practice registered nursing questions |
or by a physician's assistant relating to physician assistance |
questions are admissible in workers' compensation hearings only |
if notice of the testimony to be used is given and service of a |
copy of the letter or report is made on the opposing counsel 14 |
days before the scheduled hearing. |