Twista's Weed Case Dropped

Rapper Twista and his pals are off the hook for a marijuana arrest, thanks to their driver taking the fall in the case ... TMZ has learned.

We broke the story ... Twista, 2 other passengers and the driver were pulled over by cops in Indiana who found a 1/2 ounce of weed in the vehicle. Initially, all four were arrested because prosecutors said no one claimed the pot.

Sources with direct knowledge of the case tell us Twist and co. reached an agreement with Porter County prosecutors -- 3 of the 4 cases will be dismissed, including Twista's. We're told the driver admitted the weed was his. He's getting off with probation, and no jail time.