Ron Garretson -- a longtime NBA referee -- was arrested for DUI in Arizona on Wednesday after officials say he crashed into a tree near the Lake Havasu City Police Dept. Station.
Cops responded to calls about a man who slammed an orange Jeep Wrangler into a tree around 6:30 PM -- and when officers arrived at the scene, 60-year-old Garretson was covered in blood.
According to the police report, Garretson initially claimed someone had hit his car -- but cops say the story didn't make sense. Cops also say he reeked of booze and Garretson admitted to having a beer and a shot at a nearby cigar bar before getting behind the wheel.
Cops also say Garretson made it a point to say he's an NBA ref -- and insisted he's in great shape.
Despite that, Garretson bombed field sobriety tests -- and blew a .19 on the breathalyzer, more than TWICE the legal limit. He was arrested at the scene and hauled to a nearby station where he was booked for extreme DUI.
Garretson has been working in the NBA for 32 seasons -- working more than 1,900 regular season games.