The state toxicologist, or certified instructors, will certify as "external standard changers" operators found by them to be competent and qualified. In addition to being qualified as "operators" these persons must receive approved instruction covering the changing of simulator external standard solutions and compressed gas cylinders for approved breath test instruments, taught by a certified instructor.

If an external standard changer fails or refuses to demonstrate to the state toxicologist or to a certified instructor, that he or she has the ability to adequately perform his or her responsibilities as an external standard changer, then the state toxicologist will suspend their permit.