Stevens was also found guilty on two other civil traffic violations, according to numerous news outlets covering the trial.
Stevens was arrested in March by Scottsdale police and found to have a blood alcohol content of .204, more than three times Arizona's legal limit of .15. That made Stevens' DUI an extreme case, and the guilty verdict carried a mandatory minimum jail sentence of 30 days, according to Arizona law.
There is no date for sentencing.
Stevens returned to Tampa Bay on Friday for the Bucs' final practice before Sunday's game in Seattle. Buccaneers head coach Jon Gruden gave no indication how much Stevens would play on Sunday. But Gruden's opinion of Stevens, at least publicly, hasn't wavered.
"As we said, the process, rightfully so, is going to run its course and when it was over he would be back here," Gruden said. "And here he is, and it's great to have him back. Hopefully we can get this whole matter resolved and move on with what I think is a pretty damn good kid and football player's life."
The Bucs and Seahawks play at 4:15 p.m. on Sunday.