New Cancer Blood Test; Re-Evaluating School Police

A new treatment could be a game changer for some patients with tumor-based cancers. It's a simple blood test that shows recurrence of cancer months before it can appear on MRIs, CT scans and X-rays. We speak to a doctor and a patient using the test. And, we speak with the executive director of the National Association of School Resource Officers, about the strengths and weaknesses of school policing.