We had a couple of threads I think where it was mentioned that it would be nice if there was a poster that focused also on the proper fit part of the law- well, here it is! It's from OTS, and Kids Are 1st, an organization I work with a lot, just posted it on their website. Enjoy!
http://kidsare1.weebly.com/california-booster-seat-poster.html
http://kidsare1.weebly.com/california-booster-seat-poster.html