I read it somewhere. It is even on Arnold's official website.
I really wish he hadn't run for governor. I had so much respect for him before all of this. :(
Here it is from his official site.
"OK, so getting arrested wasn't exactly part of the original plan, but in many ways it couldn't be avoided. Here's what happened: As a good citizen of Austria, Arnold was required by law to serve a year in the army. Fine, he started serving. He was assigned to be a tank driver. Fine, he started tanking. He was forbidden to leave the base to compete in any stupid bodybuilding competitions. Fine, he wouldn't leave the base to compete in any stupid bodybuilding competitions. But, hey, they didn't say anything about smart bodybuilding competitions, did they? So one day, he slipped out of camp, hopped a train to Stuttgart, and -- quite smartly -- won a trophy."
http://www.schwarzenegger.com/en/athlete/mreverything/index.asp?sec=athlete&subsec=mreverything