We received these letters as well at the same time as our DOT Audit was starting. I then inquire to our supplier for Drug and Alcohol testing and they did confirm we needed the training even though we are a small OO shop (1 truck but 2 drivers). To this day we have not done the training, there is just no time to fit it in. I expected the auditor to let us know that the training would be required but he never pointed this out although he never asked if we completed it; he only requested proof of participation in a D&A program, which we provided. The audit was finally completed in March, it took 4 months to complete and was done remotely, and we passed the audit. Once the audit completed, we did receive a final letter from these Bozos indicating this was the final letter, like the others, they went to the trash can. I guess they have their limit as to how many times they will try to get your money. Be careful with these types of requests , you should always go to the right source for information before proceeding with unknown companies. Always ensureunless they are true reps of the authorities, which this one had a name similar to the authorities but at the bottom of the letter in small print their was a disclaimer indicating that they were not the DOT.