Mandatory drug testing 'bonkers' - Professor David Nutt
30 January 2013 Last updated at 17:32 GMT
Professor David Nutt has said the suggestion that people should face mandatory drug testing by their employers is "bonkers".
The former advisor to the UK government said the idea - suggested by Metropolitan Police Commissioner Sir Bernard Hogan-Howe - would lead to "an enormous amount of errors" and "no net benefit".
He said a "rational approach" to drugs, as seen in the Netherlands, Portugal and Colombia - where the government has announced plans to legalise personal use of drugs like ecstasy - would have more impact.