Defendant appealed the decision of the trial judge sustaining the violation of R.I.G.L. 1956 § 31-14-2 (prima facie limits).  The Appeals Panel held that it lacked the authority to assess witness credibility or to substitute its judgment for that of the hearing judge, unless the decision was clearly erroneous.  As the decision of the trial judge was not clearly erroneous, the Court sustained the violation.