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Oklahoma mom goes viral for TikTok on active shooter drill with 5-year-old son

An Oklahoma mom has gone viral on TikTok for a video showing her going over active shooter drills with her 5-year-old son as he prepares to go to school. Cassie Walton joins CBS News' Lana Zak to talk about why she felt this was an important lesson for her child and how she feels about the response.
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