- 47 - or distributive occupations shall be at least 16 years of age and shall have legally left the full-time school to engage in employment. Enrollees in evening and part-time extension classes shall be employed or about to be employed in the occupation for which instruction is supplemental. To be con- sidered supplemental, the instruction must be such as to increase the skill or knowledge of the workers in the business or distributive pursuit in which they are employed. 2. 22 High School Cooperative Enrollees. High school cooperative classes in business, distributive and diversified programs may be conducted for persons who are enrolled in a voca- tional, technical, or secondary high school. Student-learners enrolled in cooperative training classes shall be at least 16 years of age and be legally employed in a business, distributive or diversified occupation under agreement (preferably written) between the school and the employer. Such employment shall be in conformity with federal, state, or local employment regulations, When employment is in establishments engaged in inter-state commerce, such employment shall be at least at the legal minimum wage, except when an exemption certificate is secured from the Wage Determination and Exemption Branches of the Wage and Hour Division, United States Department of Labor, permitting employment at a sub- minimum wage. In certain occupations declared hazardous by the United States Department of Labor under the Fair Labor Standards Act, or by State Regulations, student- learners must be 18 years of age unless specific exemption has been obtained to permit those between the ages of 16 and 18 to work at such occupations. Only those classes composed entirely of persons employed in distributive occupations may be reimbursed from federal or matching funds. The training provided through the operation of cooperative programs shall be for skilled or semi-skilled occupations which offer opportunities for training and advancement, and the instruction shall be designed to enlarge the vocational intelligence of the enrollees. 2.3 Procedures and Records Used by the State to Assure that Enrollees Meet Requirements. Records and reports received from schools provide pertinent information concerning classes and instructors as indicated in Section I, 4.6 and 4.7 of this Plan. Local counties shall be responsible for keeping within