Once a couple years back I was driving a friend to the doctor in Stockton(San Jooaqin county)from Calaveras county and the state had an emission control pullover with highway patrol waving over vehicles to put up on a ramp and jam the wand up your exhaust.I pulled over and told the tech I'm not taking no smog test as I reside and my 87 Mighty max is reistered in Calaveras county where no bi-annual smog is required.They gave me some crap but let me back out of the line.This was a voluntary deal on Hiway 88,near I-5.