I didn't have to do a full on MLA format with the citations or anything like that until i got to college. We did one essay like that my senior year and at the end he said he wasn't even going to look at the ctitations. I did try to plagarize once and i got a really bad grade. I didnt check for spelling or anyhting and my teacher asked me if i really wrote it and i admitted i didnt.
He gave me a second chance and i had to redo the essay and have it on his desk in two day. He had the original assignment was like two months worth of research. I was still in high school. College is a different ballgame. They signed what was in essence a contract. Give them zero's this time and make this count toward their final grade. They will learn that way and if they don't, report them to the admin.
I learned my lesson and i write everyhting myself now!