Tim Black examines several mass shootings since 2009 for mass shooting evidence from gun access to type of gun used to mental disorders, drug usage to .\r<br>\r<br>More than 95% of gun-related killings were committed by people with no diagnosed mental disorder. But youll never know that from listening to the GOP .\r<br>\r<br>For his main Last Week Tonight segment Sunday night, John Oliver dove deep into the issue that has been top of mind for every major Republican presidential .\r<br>\r<br>The industrialized worlds gun violence problem is being measured in the wake of the most recent massacre in Oregon. GOP Presidential candidate Donald .
