There is surprisingly little research testing the accuracy of
dog tracking evidence. What evidence exists suggests the error rate
is high. See the materials in this section.
Survivability of Human ScentBy Stockham, Slavin, & Kift. Forensic Science Communications October 2004 – Volume 6 – Number 4. Study discussing using human scent evidence to identify bomb-makers, discusses whether human scent is more durable than previously believed.
Champion Article--Those Doggone Sniffs Are Often WrongBy Jeffrey S. Weiner; Kimberly Homan, this is an excellent article from the April 2006 Champion magazine that questions the use of dog scent detections and surveys applicable law.