Marcus Jordan Admits To Substance Abuse Issues After DUI Arrest

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Marcus Jordan is now admitting he has a substance abuse problem ... weeks after he was arrested for possession of ketamine and driving under the influence.

In a new court filing, obtained by TMZ Sports, Jordan and his attorneys revealed the 34-year-old has been dealing with "challenges" related to his "alcohol/substance use" ... and now, he wants a judge to order him to complete a Pre-Trial Substance Abuse Education and Treatment Intervention Program in an effort to help him with these issues.

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Jordan's attorneys argued the program would "not only benefit him personally but also serve the community by reducing the likelihood of future offenses."…