To keep the endorsement on your license you have to take the hazmat test everytime you renew your license. So every 4 yrs you have to retest. I didn't know this at the time. So when I went to renew my license the lady said ok computer #4. I was like wow, I have to take the test again? She said yeah lol. So I hadn't studied, so I failed that day, took it the next day and passed. Its PITA, but I gotta have it for work. Might as well take the tanker test too, its alot easier.
yeah already have a tanker endorsement, I used to deliver bulk oil.