Post signs identifying the caretakers. First, do the groundwork of helping them to understand what constitutes a particularly noble life. In history and literature classes, regularly weave in a discussion of motivations, actions, and consequences. Insist that quality matters. Homework should be handed in on time, neat and complete.
Details do count.
Help students form friendships. When forming cooperative learning groups, keep in mind both the academic and emotional needs of the students. These groups can be an opportunity to group students who might not otherwise interact with one another. Ensure students have a firm understanding of what constitutes plagiarism and of the school's firm policy against it. But, more importantly, help them to understand why it is wrong.