Four-time Olympic champion Michael Johnson believes it is "unrealistic" to think athletics will ever be drug-free.
Six Jamaicans, including former 100-metre world-record holder Asafa Powell and 2004 Olympic sprint relay champion Sherone Simpson, tested positive for banned substances earlier this year.
Johnson says athletics is a microcosm of real life and in real life you will always have people who cheat.
He further says it is unrealistic to expect athletics to be drug-free.
Johnson believes the Olympics is the saving grace of athletics but thinks the sport needs to adapt in order to improve its appeal.
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