(a) Testing or retesting for the presence of drugs or alcohol by an employer shall be carried out within the terms of a written policy which has been distributed to every employee subject to testing, and is available for review by prospective employees.
(b) In order to comply with the provisions of this article, employers must provide employees, when requested and/or as appropriate, with information as to the existence and availability of counseling, employee assistance, rehabilitation and/or other drug abuse treatment programs which the employer offers, if any. The employer is not required to offer any of the benefits listed above by this article.
(c) Within the terms of the written policy, an employer may require the collection and testing of samples for, among other legitimate drug abuse prevention and/or treatment purposes, the following:
(1) Deterrence and/or detection of possible illicit drug use, possession, sale, conveyance, or distribution, or manufacture of illegal drugs, intoxicants, or controlled substances in any amount or in any manner, on or off the job, or the abuse of alcohol or prescription drugs;