(a) A person teaching an avocational subject shall have three years of preparation and/or experience in the subject which the individual is employed to teach. When no such prepared and/or experienced person is available after extensive recruitment, an individual with less preparation and/or experience may be employed upon a finding by the chief school officer that such individual has sufficient preparation and/or experience to teach the subject.

(b) A person teaching an occupational education subject for which no high school credit is granted and for which there is no appropriate teaching certificate shall have three years of preparation and/or experience in the subject which the individual is employed to teach. When no such prepared and/or experienced person is available after extensive recruitment, an individual with less preparation and/or experience may be employed upon a finding by the chief school officer that such individual has sufficient preparation and/or experience to teach the subject.