What is the Statutory Protection Order statute of limitations?

I have a CPO that was set up in southern California in Dec 2011 and expired in Northern California in Dec 2014 and today. At my present employment, I am up for a promotion. I have to submit it and I have to pass a background check for part of the application. Because of the background check, I have been denied jobs before and I don’t want to risk my current work. What am I capable of doing? I love my work very much.