Even though the National Abortion Rights Action League has given the great state of California an "A+" for their pro-choice laws and lack of anti-choice regulations, unbeknownst to many, the state's legislature passed a draconian measure in September of 2005 which was ardently anti-choice. So anti-choice is this measure, the usually Playstation 2/X-Box-focused students of the California's public schools have even started a ballot initiative and a website so that they can retain their choice.
Their choice to have an abortion free from parental involvement? No, of course not. It's perfectly legal for California's high school students to leave school for an abortion and if they do the school has no legal right to tell their parents.
But, the schools are legally required (or will be come so in July of 2007) to completely prevent them from buying Coke, Pepsi, Mountain Dew, Dr. Pepper, Faygo's Rock'n'Rye and a plethora of other varieties of pop (I'm from Michigan - it's pop, not soda) at school during school hours.
Make sure you check out Serge's take on the rules regulating California's schools and a hypothetical conversation at the LTI Blog.