Any employee of a local, state or federal government agency who serves in a law-enforcement, crime prevention or criminal justice capacity is eligible to be trained and certified as a crime prevention specialist. The chief executive of any local, state or federal government agency may designate one or more employees in his department or office, who serves in a law-enforcement, crime prevention or criminal justice capacity, to be trained and certified as a crime prevention specialist. No person who is a candidate for certification shall serve as a crime prevention specialist unless his certification is approved by the chief law-enforcement officer of the locality wherein the person serves.