I know that schools have access to tools into which they can input a student's work to check it against a database (and maybe the internet?) to detect possible plagiarism. Do you think something that has been "spun" would still be detected by such a tool?

I have noticed some of these low-quality posts (especially with respect to grammar) on here as well. Is the best defense against this type of post simply down-voting, or is there anything else that can be done?