(a) The executive secretary shall select a medical review officer to assist the Commission in the evaluation of licensees tested under this subchapter. A medical review officer must be professionally trained to evaluate substance and alcohol abuse. In the performance of his or her duties under this subchapter, the medical review officer may designate other persons in the same general locations as the various licensed racetracks to evaluate licensees. To be designated by the medical review officer, a person must be professionally trained to evaluate substance and alcohol abuse.(b) The laboratory at which a specimen obtained under this subchapter is analyzed shall report all test results in writing to the medical review officer.(c) The medical review officer shall review each test result received and determine whether the result constitutes a prima facie violation of the Commission's rules. The medical review officer shall then notify the Commission in writing of each prima facie violation. Not later than five days after receipt of written notice from the medical review officer of a prima facie violation, the tested licensee shall be notified in writing of the alleged violation.