The Insurance Commissioner shall approve rating plans for workers' compensation insurance that give specific identifiable consideration in the setting of rates to employers that implement a drug-free workplace program pursuant to rules adopted by the Workers' Health and Safety Division. The plans must take effect January 1, 2000, must be actuarially sound, and must state the savings anticipated to result from the drug testing. The credit shall be at least five percent (5%) unless the Insurance Commissioner determines that five percent (5%) is actuarially unsound. The Insurance Commissioner is also authorized to develop a schedule of premium credits for workers' compensation insurance for employers who have safety programs that attain certain criteria for safety programs. The Insurance Commissioner shall consult with the Director of the Division of Labor in setting such criteria.