what's good for the good is good for the gander

This is plain senseless:
http://www.cbc.ca/story/canada/national/2006/03/08/plagiarism-software060308.html
What is wrong with teachers checking their students' papers against a plagiarism service when there is a doubt? Of course any respectable student will string together eight consecutive words from another source, and he/she has the responsibility to give the original author credit for it. If he/she doesn't, then its plagiarism. Copyright and author's rights aside, does the freedom to cheat override the right to an education? With the increased availability of others' materiel online to students, teachers should have access to an increased ability to check!