There is no mandate for the CAO to certify, but they are welcome to do so. 

For instructions on how to access the certification test (for local government), see https://archives.utah.gov/knowledge-base/access-the-certification-test-local-government/

For instructions on how to access the certification test (for state employees), see https://archives.utah.gov/knowledge-base/access-the-certification-test-state-employees/