Thanks for posting that, brought a tear of joy to my eye.
News in Hawaii was the law did not provide for an opt out but like the Seattle kids they could have not shown up during testing. At my school a few students wether random or not did not show up for the exam. The next day I had a vice principal give me about 5 notes to students saying they had to attend the make up exam. He even emphasized the tell them they must attend. I gave them the notes but instead of the "must be there" I gave them a "good job"

I like the idea of a class sit out, it could work, and I know next years junior class advisor. Fun Times!
Aloha