Seventy-two new problems have been added in this new edition. A number of these new problems concern authentication of social media and electronic evidence and the authentication of DNA with interesting chain of custody problems. Additional problems have been added dealing with expert evidence, including validation of new types of expert and lay testimony regarding cell tower tracking. Three new problems in the area of attorney-client privilege examine the application Federal Rule of Evidence Rule 502. Many of the new problems draw their inspiration from recent appellate opinions dealing with cutting-edge evidence issues.