My sincere condolences to all those involved.  However, the author should make it much more clear that a polygraph examination is only a tool, one of many, to assist an investigator.  The passing, failing, or inconclusive finding does not give incontrovertible evidence of guilt, innocence, or evidence.  Moreover, confessions, while also more direct, must also be with corroborating evidence.  As such, the article should explain this in more detail.  In closing: frequently, when competent investigators review all available data and determine that a person of interest appears to be guiltless, a polygraph examination successfully passed will often be the determining factor in the exoneration recommendation.