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Department not commenting on the case as it is pending. bret? >> well continue to follow this. david, thanks. >> popular social media app. tiktok is at the center of a new controversy tonight as parents and critics argue some trends on that platform are becoming detrimental to childrens physical and mental health. correspondent mark meredith shows us tonight. >> currently 36 degrees. >> amazon smart speaker can do a lot. crystal never thought it would encourage her daughter to play with a electr...