The NFL underdog index: which teams could spring a Super Bowl surprise?, NFL
Goodbye, pass interference replay review - Lessons learned from the NFL's failed officiating experiment - ESPN
New pass interference reviews lead to lots of confusion
Pass interference challenges are dead for the 2020 NFL season
NFL must make pass interference calls challenge-able for 2019
The NFL's pass interference replay challenge system has been a failure - Behind the Steel Curtain
Pass Interference or Not? No One in the N.F.L. Seems to Know - The New York Times
Biggest blown call of season may prove NFL officials are wrecking new pass interference rule
Roughing-the-passer calls frustrating defenders
Can you challenge pass interference in the NFL? Replay rules and more about OPI, DPI in 2020
Pass Interference: Good or Bad in today's game?
NFL makes pass-interference calls (and noncalls) reviewable - Los Angeles Times
NFL makes pass interference calls and non-calls reviewable for 2019 season - Field Gulls