I am a PhD student, and have just finished the last part of my course requirement. My last assignment is to review several other student's term projects from a seminar course.
One of the projects I have been asked to review is rife with plagiarism. More than 75% of the paper is plagiarized, from over two dozen different sources, including academic papers, stackoverflow.com, and wikipedia. I have reported all of this to my professor, along with a detailed summary of which parts are taken from where.
However, some of the paper appears to be plagiarized from the student's own earlier assignments, in a different course. It's fairly obvious that this is the case because they first plagiarized the assignment description to summarize the problem they wanted to study, and then provide an answer to said problem, including answering discussion questions that are on the assignment, but somewhat unrelated to their main topic.
I know the professor who taught the earlier course well. Should I contact him directly? Should I suggest to my current instructor that the earlier professor be notified as well? Which course of action is more appropriate?