Richie Sambora may dodge a bullet in his DUI bust earlier this week, and not because of legal footwork -- because he may not have been DUI.

Sambora volunteered to submit to a blood alcohol test after he was popped in Laguna Beach. It may take a week before we know the results. But several sources -- who know what the alleged drunk drank -- tell TMZ Richie simply didn't drink much at all before the cops stopped him, and the blood test may register below the .08 legal limit in Calif.

True enough, if he was driving erratically and had any alcohol in him, he could still theoretically be charged with DUI. But that may not be in the cards either.