 They must understand principles of human development, anatomy, physiology, pharmacology, They must also have a working knowledge of the many legal issues impacting health care such as consent, handling of evidence, mandatory reporting of child and elder abuse, and involuntary psychiatric holds.They must be adept and comfortable working with patients of many different backgrounds, cultures, religions, ages and types of disabilities.They must also be able to deal with situations which are difficult, emotional or disgusting.