Police were called to the Ross County Fair in southern Ohio Wednesday night because Barbara Newstrom had brought her service dog with her. The Iraq War veteran has a brain injury and suffers from post-traumatic stress disorder. Her dog was wearing a service vest, but sheriff's deputies still asked for documentation and then told her to call them before coming back to the fair. However, ADA law does not require that documentation be carried by a dog's owner or that owners must "check in" before entering businesses to avoid problems.