Savulescu: Many performance enhancing drugs are legal
25 November 2013 Last updated at 15:30 GMT
The medical ethicist Julian Savulescu tells HARDtalk's Stephen Sackur the current doping rules in sport are not working.
He argues that athletes already take many legal performance enhancers and the authorities should have an open mind when it comes to altering the doping rules in order to make them more enforceable.
You can watch the full interview on BBC World News on Monday 25 November at 14:30 and 20:30 GMT and on the BBC News Channel at 00:30 on Tuesday 26 November.