Campaigners are demanding a review into the outlawing of mephedrone after the drug was reportedly cleared of blame over the deaths of two teenagers.
The deaths of Louis Wainwright, 18, and Nicholas Smith, 19, from Scunthorpe, Lincolnshire, contributed to a furore over the then "legal high" after it was thought they had taken the drug.
It was made illegal last month by the former government, becoming a class B drug, along with cannabis and amphetamines.
But according to the BBC, toxicology reports showed that neither of the teenagers had mephedrone in their blood when they died.
Campaigners called for a "fresh look at different ways of formulating drug policy".
Professor Colin Blakemore, of the UK Drug Policy Commission, said: "The only good that might emerge from this fiasco is a long overdue review of drug control policy."
Roger Howard, chief executive of the commission, said: "We believe the new Government has an opportunity to both better protect the public and save money by reshaping the architecture for decision-making. Getting the governance right will lead to better outcomes for every community in Britain, and rebuild trust between experts and politicians."
More tests were being carried out to establish what, if any substances, the pair had taken.
An inquest will be held later at North East Lincolnshire Coroner's Court.
Humberside Police, who are investigating the deaths, originally said they had information to suggest they were linked to mephedrone, also known as M-Cat, miaow miaow and bubbles. In a statement at the time, they advised anyone who had taken the drug to seek medical treatment urgently.
May 29, 2010
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Campaigners urge Mephedrone review