No employer may require, request or suggest that any employee or applicant submit to a substance abuse test except in compliance with this section. All actions taken under a substance abuse testing program shall comply with this subchapter, rules adopted under this subchapter and the employer's written policy approved under section 686. [1989, c. 536, §§1, 2 (NEW); 1989, c. 604, §§2, 3 (AFF).]