How may an employer show themselves to have provided a "reasonable accommodation" to employees who have been directed by a physician to use CBD, even though such use may result in a positive drug test?

An employer would follow the “accommodation” guidelines as indicated in their employment policy. The corporate HR group should assess whether or not efforts have been appropriate and should indicate when those efforts have been exhausted. Reasonable accommodations are changes made to accommodate a person’s disability, i.e., allowing someone to sit instead of stand, modifying work schedules, modifying work duties, placing an employee on leave until they complete all medication, etc.