3 Doors Down Bassist Todd Harrell Arrested -- Another DUI Mug Shot

3 Doors Down bassist Todd Harrell has figured out a way to spruce up his DUI mug shot ... with a blue do-rag and a goofy grin.

Harrell was arrested last night in D'Iberville, Miss. ... police say they found him slumped over the steering wheel at an intersection.

According to cops ... the DUI involves some sort of drug ... not alcohol.

Harrell has a serious DUI history ... he was busted for killing someone last April and charged with
vehicular homicide. His car struck a pickup truck, killing the driver. Cops say he was under the influence of alcohol and Rx pills. The criminal case is pending.

His first brush with DUI was back in July 2012. So he's no stranger to driving under the influence. He was convicted but did no jail time ... he was required to take an alcohol ed course.

We're guessing he flunked.