[ethanbond]

Maybe in large academic publications. A middle school, high school, or even undergrad book report style document? You betcha copy/paste would be indicative of something, especially if a few students copy/pasted a lot more than the class average.

Also, this is just one signal and would be powerful as the preliminary one. There would probably be a few false positives, but nearly no false negatives. It's not like kids are going to be expelled for copy/pasting documents, but it certainly warrants more suspicion.