(a) An employer may take adverse employment action based on


(1) a positive drug test or alcohol impairment test result that indicates a violation of the employer's written policy;


(2) the refusal of an employee or prospective employee to provide a drug testing sample; or


(3) the refusal of an employee to provide an alcohol impairment testing sample.


(b) Adverse employment action under (a) of this section may include


(1) a requirement that the employee enroll in an employer provided or employer approved rehabilitation, treatment, or counseling program; the program may include additional drug testing and alcohol impairment testing; the employer may require participation in the program as a condition of employment; costs of participating in the program may or may not be covered by the employer's health plan or policies;


(2) suspension of the employee, with or without pay, for a designated period of time;


(3) termination of employment;


(4) in case of drug testing, refusal to hire a prospective employee; and


(5) other adverse employment action.