Broomgate

Following the controversy, these mustard-yellow broom-heads are the only legal broom-heads certified by the World Curling Federation for competitive play.

"Broomgate" also known as brushgate was a technology doping controversy in the sport of curling during the 2015–16 season. It was caused by the result of new brush head technologies and sweeping techniques that dramatically altered how the game was played that season. It resulted in a World Curling Federation summit to regulate and standardize brushes in the sport.