3:36 PM PT — Darius Rucker‘s legal professional, Mark Puryear, tells TMZ … “Darius Rucker is fully cooperating with authorities related to misdemeanor charges.”

Darius Rucker bought busted on a minor drug offense in Tennessee — and from the sound of the cost he was booked on … it principally quantities to an alleged handoff.

The nation singer — clearly well-known from Hootie & the Blowfish — was taken into custody Thursday in Williamson County, which is the place he lives. He posed for this mug shot for the Sheriff’s Dept. there … and was booked on three separate fees, all misdemeanors.

Darius was arrested for 2 counts of easy possession/informal change of a managed substance and one rely of a violation of the state’s car registration regulation.

By way of what DMV regulation cops suppose Darius broke … they’re saying he let his/tags expire on his automotive.

DR was introduced into the jail round 10 AM PT, and he was launched about an hour or so later — we have confirmed Darius bonded out and is not in custody.

Unclear what precisely occurred that led as much as his arrest — we’re attempting to come up with police now for additional clarification.