Individuals who wish to add a Hazardous Materials Endorsement (H) onto their CDL license will need to complete this course before they will be permitted to take their knowledge test for hazardous materials. Upon completion of this course the results will be submitted to the FMCSA Training Provider Registry. Prior to providing any testing services CDL Testing centers will retrieve these results from the FMCSA Training Provider Registry to confirm that the student has completed this course.