(a) A teacher, librarian, school counselor, or nurse shall advance one step on the minimum salary schedule under § 21.402 for each year of experience as a teacher, librarian, school counselor, or nurse until step 20 is reached.
(b) For each year of work experience required for certification in a career or technological field, up to a maximum of two years, a certified career or technology education teacher is entitled to salary step credit as if the work experience were teaching experience.

(c) The commissioner shall adopt rules for determining the experience for which a teacher, librarian, school counselor, or nurse is to be given credit in placing the teacher, librarian, school counselor, or nurse on the minimum salary schedule. A district shall credit the teacher, librarian, school counselor, or nurse for each year of experience without regard to whether the years are consecutive.
(d) As long as a teacher or librarian who received a career ladder supplement is employed by the same school district, the teacher or librarian is entitled to:
(1) placement on the minimum salary schedule at the step above the step on which the teacher would otherwise be placed, if the teacher or librarian received a career ladder supplement for level two of the career ladder on August 31, 1993; or
(2) placement on the minimum salary schedule at the step two steps above the step on which the teacher would otherwise be placed, if the teacher or librarian received a career ladder supplement for level three of the career ladder on August 31, 1993.