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In-play driver testing began this season on the PGA Tour and at last week’s Safeway Open multiple players were deemed to be using non-conforming drivers, according to one source with knowledge of the testing.
The source didn’t know how many drivers failed the CT (characteristic time) test, which uses a pendulum to measure the amount of microseconds a metal ball is in contact with the face when it’s swung against it, but according to a Reuters story five players had drivers that were deemed non-conforming.
“Unannounced” driver testing, which is conducted at Tour events by the USGA, began this season and the Tour held an informational session during the season-opening Military Tribute at The Greenbrier earlier this month.