Seems pretty simple to me. There is no DUI if the cops don't run any tests. I can't think of ANY reasons why the cops would not run any tests. Can yoU?$$?$?
I'm 99% sure Tiger let loose on T-day, got plastered, and drove.
It's just a simple-ass DUI, no harm done ( nobody died).
Surely you can hire a driver for well under 250k/year, if you make mega-millions as a jock.
He had to be wasted, case closed.