"How Dangerous is This Person?" Author/Therapist | NBC Bay Area

"How Dangerous is This Person?" Author/Therapist

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    Therapist Ronald Mah wrote a book called "How Dangerous is This Person?" and speaks about signs to look for in children. His comments come after a 12-year-old boy was arrested on Saturday in connection with stabbing his 8-year-old sister, Leila Fowler, to death in Calaveras County. Kim Tere reports.