Lucky Whitehead was so wasted during his DUI arrest back in December ... he told cops, "I'm not alright to drive" -- it's all in police footage obtained by TMZ Sports.
The ex-Dallas Cowboys receiver was pulled over on Dec. 23 in Gainesville, Virginia around 2:12 AM after he ran a red a light ... and when cops got him out of the vehicle -- it was clear he was DRUNK.
Whitehead was slurring his words, babbling incoherently and absolutely bombing field sobriety tests. Oh, and he admitted to having beer and mixed drinks before getting behind the wheel.