12:44 PM PT -- Lynch's mugshot has been released ... and he appears to be struggling to keep his eyes open.
Ex-NFL star running back Marshawn Lynch was arrested in Las Vegas on Tuesday ... after cops claim he was driving under the influence.
LVMPD says 36-year-old Lynch was pulled over near the Las Vegas Strip on Fairfield Avenue and West Utah Avenue around 7:25 AM on Tuesday. Sources tell TMZ Sports he was driving into curbs on the side of the road before the traffic stop.
After speaking with Lynch, cops believe he was driving under the influence ... and was taken to jail.
Lynch did not submit to a breathalyzer, but we're told he had his blood drawn.