Rory McIlroy, facing driver drama, switched clubs at Quail Hollow. Rumors during the PGA event hinted that his driver failed a legality test, affecting his performance, which led him to finish 47th. The violation stems from worn drivers giving undue advantage, a focus for PGA's random pre-tournament tests. Fellow golfer Scottie Scheffler confirmed his driver change, pushing for stricter testing standards. Confidentiality around these tests aims to avoid unfair scrutiny but invites speculation.