"The court has no crystal ball," Conner wrote. "It may well be that Johnson will endeavor to escape again. But Mr. Johnson . . . will be subject to three decades of improvements in institutional security over the general population. The Department has at its disposal a broad array of investigative and penological techniques to dissuade even the most entrenched escape artist. Surely, there are less restrictive means to monitor Mr. Johnson than solitary confinement."