In hour two of Here & Now’s April 2, 2018 full broadcast, we speak with a former researcher at the CDC about the agency’s work on the causes of gun violence, something that has fallen off since the so-called Dickey Amendment of 1996. Also, do you want more control over your Facebook page? We speak with tech correspondent Ben Johnson about a new layer of protection Facebook has announced for users and their data. And, on what would be Marvin Gaye’s 79th birthday, we visit the archive of the “Prince of Soul” in our latest DJ Session.