It shall be unlawful for any boxer to participate or attempt to participate in a professional match, contest, or exhibition of boxing while under the influence of alcohol or any drug. A boxer shall be deemed under the influence of alcohol or a drug for the purposes of this Code section if a physical examination made during a period of time beginning not more than six hours prior to the beginning of the professional match, contest, or exhibition of boxing and ending not more than one hour after the completion of the professional match, contest, or exhibition of boxing reveals that the boxer's mental or physical ability is impaired in any way as a direct result of the use of alcohol or a drug.