Also, again, not being snarky, but if I recall correctly (and I may be wrong, since it has been a long time since I have followed the case closely) the confession of the one defendant, Jessie, was not allowed to be entered in evidence against them at trial because Jessie refused to testify against the others.
I think that I also remember hearing that in addition to the hours and hours of interrogation, his father was going to go out and buy a new truck, because there was going to be a reward for Jessie if he told what he knew (which they coached him on), but I am not certain on this part. Just remember hearing something about this part in a recent TV show.
Here is the information on a lawsuit for Earl Washington Jr, one of the cases that I mentioned above:
"Washington's conviction in the 1982 rape and murder of 19-year-old Rebecca Williams, a young mother from Culpeper, was largely the result of a false confession in which
he got several key details wrong. Last year, a federal jury in Charlottesville ruled that a now-deceased
Virginia State Police investigator fabricated parts of that confession."
http://www.washingtonpost.com/wp-dyn/content/article/2007/03/27/AR2007032702240.html