The drug and alcohol testing procedures in 49 CFR Part 40 apply to employers covered by this part, and must be read together with this part, unless expressly provided otherwise in this part.

The SAP must perform the functions in 49 CFR Part 40.

An employer shall not permit an employee with direct or immediate supervisory responsibility or authority over another employee to serve as the urine or oral fluid collector, breath alcohol technician, or saliva-testing technician for a drug or alcohol test of the employee.