Trying to limit domestic terror and mass shootings should be simple, but it's not. Byron Tau of the WSJ lays out why the US Constitution is restraining the FBI's ability to reduce mass violence, and possibilities for working around it.

It goes without saying that efforts need to be made to prevent future mass shootings. What exactly is being done? And are these new gun proposals and measures effective enough to yield their intended results? Andy Duehren of the WSJ gives us more info.