If you want to be extra cautious, keep a copy of the syllabus you use. After a student passes on area, have him initial it. That way if any kinda of liability issue comes up later, you're covered. I've heard of people taking off overgross, crashing an airplane, and their families won the lawsuit against the instructor because they claimed he never taught w&b. Sadly, they even tagged the DE that passed the guy on his PPL ride for passing him, too.....