SF 49ers' Aldon Smith -- Another DUI Arrest -- Sunday Game In Doubt

6:03 PM PDT: Smith has been released from jail. The 49ers expect Smith to play on Sunday.

San Francisco 49ers linebacker Aldon Smith is on the defensive again -- legally ... he's been busted for DUI and pot possession.

Smith was popped after he crashed his pickup truck around 7 AM. He wasn't hurt ... but the breathalyzer almost was.

The 49ers say they're on top of it. San Francisco plays the Colts on Sunday ... Smith's status for the game is in doubt.

The All Pro linebacker works as a receiver off the field -- receiver of legal charges.

- Arrested in Miami last year for DUI -- later reduced to reckless driving.
- Stabbed during a party at his house in June 2012.
- Named in a lawsuit by a man who claims he was shot at Smith's house during a party.