Former heptathlete Kelly Sotherton has said that a missed test does not mean that an athlete is doping.
She was speaking after allegations that Mo Farah missed two drugs tests in the lead-up to the London 2012 Olympics.
"I've been tested nine times in six weeks before - at my house, at the track, at my partner's house," Sotherton told BBC Sport.
"But a missed test doesn't mean you are doping. It may mean you have been a little bit careless. That doesn't make you a drugs cheat.
"I was very organised and I made a slip of a number by one day. That's how a missed test can happen."
The 38-year-old won an Olympic bronze medal at Athens in 2004.
