I learned about putting netiquette rules in the rubrics and I think that's an excellent idea! I work at a school where the majority of assignments are due Sunday at 11:59 pm and I concur with the idea that this is not a really convenient due date and time for instructors. Over the years I haven't had a great deal of trouble with student conduct regarding netiquette. It was far more common in the early days of online learning. Other than plagiarism, I cannot really think of any recent examples.