The FMCSA regulations require that you develop a written policy on controlled substances use and alcohol misuse in the workplace and that the policy be provided to every driver. 

The DOT Agencies and USCG require employers to have written policies for their DOT testing programs. At a minimum, these policies must contain specific information required by the appropriate DOT Agency or USCG. Your policies must clearly delineate between the items and actions which are required by DOT and which are required by the company or employer.