Lourdes Garcia-Navarro with her husband, James Hider, and their dogs Nena (left) and Ursa. Tara Todras-Whitehill/Lourdes Garcia-Navarro hide caption

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There's data to support the notion that pot, or a drug based on its active ingredient, could help ease the fears of PTSD. Ted S. Warren/AP hide caption

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Anne Jones, 62, and Robin Jones, 73, at their home in Menlo Park, Calif. He took a test that revealed proteins typical of Alzheimer's disease. Ramin Rahimian for NPR hide caption

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Insomnia, feeling isolated, and bursts of anger are symptoms of the anxiety disorder known as PTSD. iStockphoto.com hide caption

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Some patients with PTSD suffer recurring nightmares of a single event. /iStockphoto.com hide caption

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