For the second time in two matches in a row, opponents have accused Canadian curler Mark Kennedy of cheating at the Winter Olympics.
The 44-year-old, who won gold in 2010 and bronze four years later, got into a heated argument with Swedish opponent Oscar Eriksson towards the end of the match, which his team won 8-6 on Friday.
The Swedes believe that Kennedy touched the curling stone twice, by releasing the handle at the right moment, but then touching the stone with his finger to change its direction.
Television footage shows that Kennedy actually did it.
This prompted the World Curling Federation to announce that it would hire additional referees for the remainder of the Games to monitor compliance with the rules, which is unusual for a sport in which the players themselves oversee the rules.
When the Canadians returned to the ice on Saturday to play Switzerland, Kennedy found himself at the center of controversy again, as the Swiss accused him of repeating the same offense in the game they won 9-5.
"I saw Kennedy do it while the referee was next to me," Pablo Lacha Kaspin told BBC Sport.
"I believe it doesn't affect anything, but when the referee is watching, he should see it."
"I got a little annoyed and I told the head judge that if they send an email, they have to respect what's in it. It's nothing against Mark, but you have to respect the rules."
After the accusations, Kennedy, who was later reprimanded for foul language, said: "I don't like being accused of cheating after 25 years of playing and four Olympics."
"I told Erickson where he could file charges. Maybe he was angry because he was losing."
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What did Kennedy do and was it allowed?
Each stone has a sensor that is supposed to ensure that players release the handle before the thick green line that runs across the ice.
If they do, the sensor turns green. If they don't, the sensor turns red.
In both matches, Kennedy's stone turned green, but his opponents think they saw the Canadian touch the stone after he let go of the handle, and video footage seems to confirm this.
Steve Crum, a BBC Sport commentator who covers curling, asked former world champion Jackie Lockhart if it was cheating and did it affect the result?
"You shouldn't touch the stone after you release it," Lockhart said.
"He let go of that rock and then pushed it with his finger, I'm not sure why. Was it to push it a little more because he thought it wasn't enough?"
Fellow commentator Logan Gray suggested that it might be more a matter of "muscle memory than actual cheating."
Grant Hardy, a British curler, said after the victory over the Czech Republic on Saturday that it would be a "stretch" to call it cheating.
"I'm sure Mark didn't mean anything by what he did, he was just caught doing it on TV."
"Now that it's public, it should be well regulated and I hope the athletes will do that," said captain Bruce Moet.
What will happen now?
Will there be consequences?
It seems they won't.
When the game is over, players are asked to sign a statement that they agree with the result.
After the first incident, the World Curling Federation confirmed that "decisions made during a match are final" and that they do not use replays to change a decision.
They added that touching the stone is not allowed and since this problem arose in the match with Sweden, referees were appointed to monitor the course of the match.
No violations of the rules were observed, so nothing was taken.
It is not known what the consequences of the second accusation made by the Swiss will be, but it certainly casts a shadow over the Canadians, who are considered favorites for a medal.
"The question we should be asking is whether Kennedy has done this before," Lockhart said.
"Have they done it in other competitions and now they're being called out for it? I'm a little disappointed in the Canadians if they're doing it. Now we'll all be watching closely," he added.
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