Penelope Oliver, a volunteer with Students Demand Action in California, talks to Hal about state laws involving firearms. Then, Dr. Dennis Slamon, an oncologist and chief of the division of hematology-oncology at UCLA, and Teri Boudreaux , a two-time cancer survivor and participant in a clinical trial, discuss that trial with Hal. Also, Mike Diamond, a Certified Addiction Recovery Expert, joins Hal to talk about "Sober October."