Never used steroids? Poole is full of shit along the lines of Oliva and Schwarzenegger.
Arnold fully admitted that he has taken steroids. In the 25th Anniversary edition of "Pumping Iron" he talked about it, and he's said it elsewhere in the past.
He may shy away from the issue nowadays, because he has to being Governor. I don't like it, and I'm sure with his personality Arnold doesn't either. He'd rather say "Yes I took them, probably more amounts than anyone for their day. But that was in the past and I still don't see anything wrong with them."
But in the game of politics, you cannot do or say anything like that. Especially in today's world.