Here is what I remember. You tell me if I am wrong.
DW had just broken up with a girlfriend. Thus the recent trips to the bar.
That Friday, he was drinking RUM and COKE as usual. He can handle that. Someone had been given a shot and didn't want it, so the waitress gave it to DW. He isn't used to them. He did it anyway. It hit him quickly, and that is likely the reason he left.
He had gotten a previous DUI. You don't have to be DRUNK, or OUT OF CONTROL to be pulled over and given a DUI. If, in the officer's opinion, your ability to operate a motor vehicle is in any way impaired (i.e. a judgment call, usually based on the departments need for income, and whether the officer personally knows you or you are female), you can be given a DUI. Doesn't matter whether you get a breath test and it proves you are over the limit or not.
So, what you said was totally unsubtantiated.