Can another mass-shooting in the US be stopped?

It's been two weeks since 17 people were killed in a mass shooting at a school in Parkland, Florida. Now, students and teachers are going back to class -- but are they any safer? Guests: Paul Michael Viollis, a terrorism analyst who worked as a security specialist in the New York District Attorney's Office. Michael Beer, the Executive Director of Nonviolence International. , and was arrested while protesting against concealed guns.