There are many adults that have spell check, and don't use it.
If Oregon is giving them tests on a computer, fine, then grade them on that medium. If they fail to USE the spell check functionality, just fail them, or at least seriously penalize them on any test. I know that my spelling ability has degraded since I was in school simply because my process has changed to typing as fast as possible and then editing, not thinking about each letter as a type it so that red underlines won't appear. This leads to some sloppiness that has to be cleaned up after the initial pass, but it is WAY more productive for me than torturing myself over the spelling of some words, like I would if I were writing it out with a pen. If I had pen out an entire essay now, it would probably take me three or four times as long, at minimum.
People use computers now, spell checking functions are built into almost all document editors, and no employer cares how you produce an error-free document as long as you do. These are high school students on the cusp of adulthood, not 3rd graders. It is way better to judge them on real word standards, not academic standards that have outlived their usefulness.