NBA player Iman Shumpert was arrested for having a "sizeable" amount of marijuana in his backpack at the Dallas/Fort Worth Airport on Saturday.
Officers responded to a potential drug violation call around 2:40 PM ... after TSA screeners found a plastic bag filled with a "green leafy substance" in Shumpert's bag, which he admitted was weed.
Cops say the substance weighed 6.12 ounces & tested positive for marijuana using a mobile test.
The report adds 32-year-old Shumpert -- who was set to board a Delta plane to Los Angeles at 3 PM -- expressed concern about missing his trip to visit his daughter ... but the responding officer informed him he would not be making that flight, as he was being placed under arrest for marijuana possession.
The report says the 2016 NBA champ was then placed in handcuffs & transported to the airport jail without incident.
The charge is classified as a "State Jail Felony" ... meaning Shumpert could face up to two years behind bars & a $10K fine, if convicted.
Cops also claim Shumpert -- who also won Season 30 of "Dancing With The Stars" -- had a Glock magazine and 14 9mm rounds in his bag ... although he didn't have a gun.
Shumpert last played for the Brooklyn Nets in 2020-21 ... and has also suited up for the Knicks, Cavaliers, Kings & Rockets over his decade-long career. He's averaging 7.2 points a game in his career.
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