' I have never taken performance - enhancing drugs in my life and I never will , ' he wrote .
Farah used Facebook to address the issue after Sportsmail story on his missed tests in 2010 and 2011 .
' I have never taken performance - enhancing drugs in my life and I never will , ' Farah wrote .
Farah used Facebook to address the issue after Sportsmail story on his missed tests in 2010 and 2011 .