Wednesday's national school walkout calls attention to the issue of gun violence in America's schools. In our series, Issues That Matter, we look at how the safety debate and education issues are playing out in classrooms. Jahana Hayes, 2016 national teacher of the year, and Shawn Sheehan, Oklahoma’s 2016 teacher of the year, join "CBS This Morning" to discuss how they feel about carrying a gun in the classroom, low teacher pay and mental health resources.

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