Mississippi Code Title 71. Labor and Industry § 71-7-27

(1) A private employer may affirmatively elect to conduct an employee drug and alcohol testing policy or program pursuant to the provisions of this chapter. Such election shall be made by including in the written statement of the employer's policy on drug use provided for in Section 71-7-3(1), and in the job applicant notification provided for in Section 71-7-3(4), a specific statement that the employer's policy is being implemented pursuant to the provisions of this chapter. In the event a private employer makes such an election, the private employer and its employees and job applicants shall have the rights and obligations available to a private employer and its employees and job applicants under this chapter. A private employer who has made such an election may rescind such election by posting a written and dated notice in an appropriate and conspicuous location on the employer's premises, which notice shall state that the employer's employee drug and alcohol testing policy or program will no longer be conducted pursuant to this chapter. As to employees, the rescission of such election shall become effective no earlier than ten (10) working days after the date of the posted notice. As to job applicants, an employer may rescind such election without notice to such job applicant.

(2) Any private employer who does not make such an election or who rescinds an election previously made will be deemed to not be conducting an employee drug and alcohol testing policy or program pursuant to the provisions of this chapter, and in that event the rights and obligations of the employer and its employees and job applicants will not in any way be subject to or affected by the provisions of this chapter, but will instead be governed by applicable principles of contract or common law.