Al Michaels — The DUI Mug Shot

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Al Michaels cracked a confused sorta half-smile when it came time for the mug shot following his DUI arrest this weekend … and our sources has obtained the pic. 

We broke the story … the 68-year-old broadcasting legend was arrested Friday night in Santa Monica when he allegedly made an illegal U-turn in front of a DUI checkpoint.

Michaels was arrested — and sources tell us his blood-alcohol level was JUUUUST north of the legal limit.

Sources say Michaels couldn”t have been nicer during the arrest.