Jackson (back) will be shut down for two weeks, Jeff Wilson of the Fort Worth Star-Telegram reports.
Jackson has been bothered by his lower-back since the start of camp, and after being evaluated Tuesday, he's been diagnosed with a stress reaction, an injury that's affected him in the past. As is often the case with stress-related injuries, rest has been prescribed, and the plan is for Jackson to be reevaluated in a couple of weeks.