Nothing in Sections 71-3-201 through 71-3-225 shall be construed to operate retroactively, and nothing in Sections 71-3-201 through 71-3-225 shall abrogate the right of an employer under state law to conduct substance abuse tests, or implement employee substance abuse testing programs. Only those programs that meet the criteria outlined in Sections 71-3-201 through 71-3-225 qualify for reduced workers' compensation insurance rates under Section 71-3-207.