WASHINGTON — On the top floor of a federal courthouse here, roughly two miles from the hotel where he shot President Reagan 22 years ago, John W. Hinckley Jr. is asking for a modicum of freedom. If the strides the 48-year-old would-be assassin has made in two decades of psychiatric treatment were the sole standard, he might get his wish for 10 visits with his aging parents — in the loving embrace of family, away from the penetrating eyes of hospital staff. But judgment of his mental health is not the only hurdle Hinckley must clear as U.S. District Judge...