This week, Professor of Emergency Medicine at Yale University School of Medicine and Yale New Haven Hospital Physician-in-Chief Dr. Gail D’Onofrio joins Abby in the classroom to help with her lesson plan on the opioid crisis.  Dr. D'Onofio explains what opioids are, how the opioid epidemic began and what we can do to try and put an end to the crisis.  Keep up with Abby after class on Twitter: @AbbyHornacek