My tests have always been DOT tests and I have occasionally been asked for more. Thats why I still follow the dillution sticky the morning of the test. Rather than argue with the tech I just add a little of my heavily dilluted urine to the QF as I fill the cup.

Me personally, I would rather argue with the tech than taking any chances with with a negative-dilute, or even a positive by using any of my own urine. Because with DOT testing, the guidelines and protocols must be adhered to by the collectors, otherwise the test results are void.
Since DOT requires only 45 ml of sample, and 45 ml is all the donor can submit, the collector would have to accept it. Forcing the donor to submit more than 45 ml of sample would be in violation of the DOT guidelines.

Know your rights and the DOT regs and do not be afraid to assert them. :smokin: