NFLPA President Tretter Calls for NFL Teams to Remove Artificial Turf
NFLPA president JC Tretter calls for all teams to use grass fields - ESPN
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
NFLPA President JC Tretter: Artificial turf is causing surge in injuries – Brock USA
From AstroTurf to 'frankenturf': Inside the NFL's behind-the-scenes battle to fix its turf problem
Cooper Kupp, More NFL Players Advocate for Grass Fields over Turf amid Safety Debate, News, Scores, Highlights, Stats, and Rumors
J.C Tretter: 'Only Natural Grass Can Level The NFL's Playing Field' - Sports Illustrated Cleveland Browns News, Analysis and More
NFLPA President JC Tretter Calls for Replacement, Ban of Slit-Film Turf Fields, News, Scores, Highlights, Stats, and Rumors