One of my clients recently told me that he will NEVER deadlift again. He said his past chiropractor and physical therapist essentially reamed him out when they found he had deadlifted with his personal trainer. 

Let me just say that our words as health care practitioners can have an incredible impact for our clients. It's therefore our duty to continue to understand and master our craft, instead of just relying on what school thought us years ago. I can probably bet you money that neither of his former chiropractors or physical therapists knew how to properly hinge themselves.