If you currently have a hazardous materials endorsement, federal rules require you to take the hazardous materials written test every time you renew the endorsement.

You must present a Federal Security Threat Assessment to renew a CDL with a hazardous materials endorsement. 

A vision test must be passed. No other CDL written tests are required unless you want to upgrade the group designator, remove an air brake restriction, or add a new endorsement when renewing your license.

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> Additional Commerical Driver's License Related Information
> TSA Hazmat Endorsement Threat Assessment Program

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