"While the inquiry team could see a role for employee drug testing within safety-critical areas (although even here they were far from convinced that such drug testing was effective), there was deep scepticism as to the value of such testing more broadly. Indeed, the inquiry team noted that ‘For the most part, it is unclear that anything can be achieved through drug and alcohol testing that could not be done better through other managerial and supervisory processes’"


Lloyd, Charlie and McKeganey, Neil, "Drugs Research: An overview of evidence and questions for policy," Joseph Rowntree Foundation (London, United Kingdom: June 2010), p. 54.