This is a really difficult question Dale. When assessing plagiarism in essay style reports, search engines like Google have become the ideal tool. You can assess the situation quickly and easily by simply typing in a few lines from the report that is suspected of plagiarism. When it comes to assessing design work, these methods are less helpful. I am not sure of the fastest approach to addressing plagiarism here, other than confronting your students directly and letting the honors system work for you when it can.