3:36 PM PT — Darius Rucker‘s attorney, Mark Puryear, tells 360aproko… “Darius Rucker is fully cooperating with authorities related to misdemeanor charges.”

Darius Rucker got busted on a minor drug offense in Tennessee — and from the sound of the charge he was booked on … it basically amounts to an alleged handoff.

The country singer — obviously famous from Hootie & the Blowfish — was taken into custody Thursday in Williamson County, which is where he lives. He posed for this mug shot for the Sheriff’s Dept. there … and was booked on three separate charges, all misdemeanors.

Darius was arrested for two counts of simple possession/casual exchange of a controlled substance and one count of a violation of the state’s vehicle registration law.

In terms of what DMV law cops think Darius broke … they’re saying he let his/tags expire on his car.

DR was brought into the jail around 10 AM PT, and he was released about an hour or so later — we’ve confirmed Darius bonded out and is no longer in custody.

Unclear what exactly happened that led up to his arrest — we’re trying to get a hold of police now for further clarification.

We’ve reached out to Darius’ team for comment as well … so far, no word back.