There is a BIG difference in my book between blowing .08 at a DUI checkpoint, which I feel are illegal, and are often being contested in court, and being drunk at .16
I am no fan of DUI checkpoints either...that said I have to respectfully disagree with you. In both circumstances the driver is legally intoxicated. Period. If the problem rests with the enforcement method (DUI checkpoints) then fight that battle, or if it lies with the legal limit (.08, .1 etc..), then change the law. Neither of these things reside within the realm of CO's discretion however.
I hear your point about discretion but I think that we accept absolute policies all the time. Think about the PRT. If someone cannot pass the PRT do you think that it should be at the CO's discretion whether or not they should be allowed in the Navy? What about uniform standards? Meet the standard or go home. We accept it with many policies, why not this one?