KNOXVILLE, Tenn. (AP) - Tennessee junior defensive back Janzen Jackson has been dismissed from the team.

Jackson's dismissal was announced Wednesday by coach Derek Dooley, who said in a statement he was disappointed to have to dismiss Jackson, but that his actions "preclude him from the privilege of playing" for the Volunteers.

ESPN.com's Chris Low reported Wednesday afternoon through sources that Jackson has battled substance abuse issues, and has failed multiple drug tests while at Tennessee.

The player from Lake Charles, La., withdrew from school in February, citing personal problems. When he re-enrolled last month, Jackson declined to discuss the issues he was dealing with.

"Our program has devoted a tremendous amount of energy, resources, support, and care in an effort to help Janzen manage his personal challenges," Dooley said in the statement. "I will always be there to help him as a person.

"Although I'm disappointed with this outcome, we will never compromise the long-term organizational values and goals we maintain here at Tennessee." 

Jackson started 22 games the past two seasons. He had six interceptions and 106 tackles.

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