Today marks the 10-year anniversary of the shooting at Columbine High School. On April 20, 1999, teenagers Eric Harris and Dylan Klebold opened fire on their classmates, killing a teacher and 12 students, and wounding 24 others before turning the guns on themselves. This month also marks the second anniversary of the Virginia Tech massacre, where 32 people were fatally shot by a mentally unstable student in the deadliest mass shooting in modern American history. Commemorating these attacks against the backdrop of another shooting at an immigration center in Binghamton, New York, begs the question: “How bad does it have to get before we take serious steps toward gun control?” Joining us to try to answer this question is Jeff Fagan. Jeff Fagan is a professor of Law and Public Health at Columbia Law School