Andrea Nill: Her relatives have provided a different story. According to loved ones, Valles Garcia is in the U.S. seeking asylum after receiving multiple death threats from drug cartels.
T. Christian Miller: Officially, military figures show that about 115,000 soldiers have suffered mild traumatic brain injury since 2002. But we talked to military doctors and reviewed unpublished studies that suggest far more soldiers could have sustained such wounds. While most recovery quickly, estimates suggest that between 5 percent to 15 percent go on to develop cognitive problems.