Police in Sugar Land, Texas say Adrian Peterson fessed up to throwing back shots of a vodka mix at a poker game early Sunday morning ... just hours before he was arrested for DWI.
The officer who took Peterson into custody over the weekend wrote in court documents, obtained by TMZ Sports, that the former NFL running back made the admission while the two were at a Sugar Land gas station at around 9:23 AM.
The officer alleged in the docs he encountered Peterson asleep at the wheel of a running black Mercedes SUV that was next to some pumps .