I have never heard of a woman being bound hand and foot (which rather makes raping her difficult) when there is no necessity to bother to do so. Bound women are found in homes, places of business, basements of serial killer's houses, and in trunks where the bindings are merely for ease of managing those flopping limbs.
Which brings us back to former Rep. Gary Condit. The location where Levy was found in Rock Creek Park is pretty much a skip and a jump away from Condit's home. It was also along a drive that one would take to make sure the car is not seen going from Point A to Point B.
For readers who want to take a closer view, see thistimeline and the Washington Post series. What do you think it would take to solve this cold case?