Contributor(s): Dr John Collins, Dr Michael Shiner, Danny Kushlick | Welcome to LSE IQ, a new monthly podcast from the London School of Economics and Political Science. This is the podcast where we ask some of the leading social scientists - and other experts - to answer intelligent questions about economics, politics or society. For nearly 50 years, governments around the world, led by the US, have been fighting a war on drugs. The aim? To reduce the production, supply and use of certain drugs and ultimately create a 'drug-free society'. But, having cost the US more than $1trillion to date and taken hundreds of thousands of lives, it’s a war with high collateral damage. In this episode Jess Winterstein asks why, after nearly half a century of global cooperation, haven’t we won the war on drugs? To find out what the problems with the policy are, and why the belief that prohibition is still the best way to manage drugs, still persists, she speaks to: John Collins, Executive Director of the LSE IDEAS International Drug Policy Project and coordinator of the Expert Group on the Economics of Drug Policy; Michael Shiner, Associate Professor in the Department of Social Policy and head of teaching at the International Drug Policy Project at LSE; and Danny Kushlick, founder and head of external affairs of the Transform Drug Policy Foundation. For further information about the podcast visit lse.ac.uk/iq and please tell us what you think using the hashtag #LSEIQ.