Defending London Marathon champion Eliud Kipchoge is confident Kenya's athletes will compete in the Rio Olympics after a law was passed to make doping a criminal offence.
The law was demanded by the World Anti-Doping Agency after a spate of doping infringements in the east African country famed for its middle distance and long-distance athletes.
"The president has signed and it's the law," said Kipchoge at yesterday's Virgin Money London Marathon media conference.
"That's what WADA was waiting for in Kenya, so we are safe."
Athletics has been beset by controversies involving the use of performance-enhancing drugs in recent years, with Russia currently suspended by the IAAF, the sport's world governing body.
London Marathon director Hugh Brasher said: "We are doing absolutely everything we can to have clean racing."
The London Marathon is pursuing Russia's Liliya Shobukhova, the winner of the women's race in 2010, who has since been convicted of doping.
"We have taken a court case against her to recover the money she fraudulently won from other athletes from her performances in London," Brasher added.
"We are absolutely determined to stamp it out."