Each year when determining the salary of a person who is employed by a school district as a professional school library media specialist, the school district shall add 5 percent to the salary that the employee would otherwise receive in 1 year for the employee's classification on the schedule of salaries of the school district if:
No increase in salary may be given pursuant to this section during a particular school year to an employee who submits evidence of certification after September 15 of that school year. Once an employee has submitted evidence of such certification to the school district, the school district shall retain the evidence in its records, as applicable, for future school years. An increase in salary given in accordance with this section is in addition to any other increase to which the employee may otherwise be entitled.
NRS 391.163