Sec. 4. (a) The department may not file an action under section 3 of this chapter against an employer that has knowingly employed an unauthorized alien if the alien was employed by the employer before July 1, 2011.
(b) The department may not file an action under section 3 of this chapter against an employer who used the E-Verify program to verify the employment eligibility of an individual who is determined to be an unauthorized alien.