(a) A covered employer, employer's representative, labor agent, or crew leader may not take any retaliatory actions against any agricultural laborer because the laborer has made an inquiry, filed a complaint, assisted the department's inspectors, instituted any proceeding under or related to the Act or this chapter, testified or is about to testify in such a proceeding, or exercised any rights afforded under the Act or this chapter on behalf of the agricultural laborer or on behalf of others. Under this section, retaliatory actions include discharge, causing to be discharged, discipline, or adversely affecting the agricultural laborer's pay, position, seniority, or other benefits.(b) An employer may not ask or require an agricultural laborer, as a condition of employment, to waive any rights under the Act or this chapter.