A couple weeks ago, players and manufacturers were informed that the R&A intended to test individual driver's at The Open Championship. This is the first time the rule makers have gone to these standards on the player's.
The R&A and USGA typically pull the individual drivers from the manufacturers, and not the players.
“We take our governance role very seriously, not just on the Rules of Golf and amateur status, but also equipment standards, and we felt it was an appropriate next step to more actively seek to test players' drivers straight out of the bag,” said Martin Slumbers, the R&A’s chief executive.
Out of the 156 player field, 30 players were notified that their drivers would be tested this week. Notable names including Paul Casey, Jason Day, Brooks Koepka, & Henrik Stenson. These players were selected by breaking down various brands of driver's based on equipment counts.
The R&A set-up a test center on the practice range, and according to Slumbers, not one piece of equipment was in violation. They were testing the "spring" on each driver club face.
Rory McIlroy expressed his opinion by stating he thought TaylorMade was “singled out a bit more than anyone else.”
“A manufacturer is always going to try and find ways to get around what the regulations are. It's a bit of an arms race,” said McIlroy, who plays TaylorMade equipment. “If there is some drivers out there that have went a little bit over the limit, then obviously guys shouldn't be playing them. I think the manufacturers are smart enough to know not to try to push it too much.”
On whether or not the testing of clubs would be a mainstay, Slumbers commented saying that it's not expected to become the norm of the PGA. I'm sure with the conditions of Carnoustie this week, Slumbers wanted to ensure manufacturers weren't trying to take advantage of the course.