I am a teacher at a college. I know that Turnitin performs check against existing published papers and other documents on the web.

However, in homework, the students may not copy from published papers but from each other. So, can Turnitin detect plagiarism in homework with descriptive answers? We want to detect possible plagiarism between the submissions of different students. Thus, we don't want to compare against the millions of documents on the web, but against the submissions of other students.