http://www.criminology.fsu.edu/journal/kaune-callahan.htm
Michael M. Kaune, St. Francis College : Richard Callahan, Virginia Department of Corrections
"Among the results of the survey are that officers were overwhelming in their support for the use of hair testing. They expressed confidence in the results of hair testing and the majority preferred it to testing based on urinalysis. The respondents were part of a federally-funded research project on the use of hair testing that was conducted over four years and which administered over 2,200 hair tests to probationers and parolees. We conclude that while hair testing is well liked by participating officers and is widely used as a preemployment screening device, a comprehensive testing policy based on hair analysis is yet to be implemented in a corrections setting, and it is unlikely to be implemented in the immediate future because of cost concerns and bureaucratic status quo."
