On April 17, 2004, Julia McCauley, 74 years old, wheeled herself into a stairwell and plunged to her death. In 1999, Ms. McCauley was found unattended in a foyer in her wheelchair, was deemed an ``elopement'' risk and ordered to wear an electronic monitoring device. The device is called a WanderGuard and it will set off an alarm and lock doors if she left a specified area. But, on April 17,...