Okla. Stat. tit. 40, § 142.7

A. Examinations for certification as alternative fuels equipment technicians shall be uniform and practical in nature for alternative fuels equipment technician certification and shall be sufficiently strict to test the qualifications and fitness of the applicants for certificates. B. Examinations for certification as alternative fuels compression technicians shall be uniform and practical in nature for alternative fuels compression technician certification and shall be sufficiently strict to test the qualifications and fitness of the applicants for certificates. C. Examinations for certification as electric vehicle technicians shall be uniform and practical in nature for electric vehicle technician certification and shall be sufficiently strict to test the qualifications and fitness of the applicants for certificates. D. Examinations shall be in whole or in part in writing. Any applicant initially failing to pass the examination shall not be permitted to take another examination for a period of thirty (30) days. Any applicant subsequently failing to pass the examination shall not be permitted to take another examination for a period of thirty (30) days. E. The Department of Labor shall enforce the provisions of this section.