*So the big question ever since the arrest of T.I. and Tiny is – will the rapper be sent back to prison for violating his probation on federal gun charges?

The rapper, born Clifford Harris Jr., was arrested along with his wife Tameka “Tiny” Cottle on suspicion of possessing a controlled substance – which TMZ reports is ecstasy, citing law enforcement sources.

The rapper was just released from an Arkansas federal prison last December after serving seven months on a 2008 conviction on federal weapons charges. As part of his probation, T.I. is prohibited from committing any crimes or possessing any controlled substances. An arrest on drug possession while on probation could lead to more jail time.

The U.S. Attorney’s Office in Atlanta says T.I.’s case is currently under review, reports Entertainment Weekly.

“The probation office is in the process of determining what happened and will make a recommendation regarding Mr. Harris when they have all the facts,” U.S. Attorney Sally Quillian Yates tells the magazine.

Once the probation office has thoroughly reviewed the details and context of the case, it will decide whether to bring it back to the U.S. Attorney’s office, which originally prosecuted the rapper on the federal gun charges.

“We haven’t gotten anything from the probation office yet,” a spokesperson for the U.S. Attorney told EW this morning. “There’s no automatic formula for such cases.”

The arraignment for the new charges in California won’t likely be for another two months.