San Quentin uses the gas chamber and lethal injection. They get to pick which they want and if they don't say SQ uses lethal injection.
Oh the gas chamber, I had my time in one of those, it was only cs gas though, meant to overstimulate the senses to send you into a state where you're dripping snot and spit and feel as though you can't breathe..........yeah, I miss basic training, where else do you get gassed and then the next day think "Hey, that was pretty cool!"