Yea, I agree with sal****er here.
When I first read the title of this thread, I assumed he was actually being given the traffic warrant on the spot. I didn't think that the police saw him walking down the street and did a check up on him for an outstanding one. So, was he just minding his own business when the cops approached him? Did the cops really recognize it was Matt Barnes and go "hey wait, didn't he have an outstanding traffic warrant"? Does this happen often to other people in California?