What does a CDL driver need for hazmat endorsement?

To get a hazmat endorsement one must pass a written or digital test to get it. Most of which is taught by certified instructor when you train for your CDL Class A license along with double and triples endorsements.for the most part its like takeing you air brake test.Once your have your endorsements you must follow federal and state as well company guidelines on hauling their freight.

I believe most of what you need can be found here..... https://www.tsa.gov/for-industry/hazmat-endorsement

Also you will need your birth certificate or passport.