Team challenge report

Through Week 4 games For reference, the percentage of calls challenged by the replay officials is shown. Obviously, the replay official does not lose a challenge or a timeout with an incorrect challenge, so his percentage tends to be low. Ten teams have not had a coach's challenge, including the Vikings

Training tape: defenseless receiver, taunting, clock on out-of-bounds fumble

Dean Blandino, NFL vice president of officiating, released this week's media tape regarding rules calls mostly from Week 4 (150 MB download). This week's topics: When defenseless protections end. The play in question was a legal hit on Lions receiver Calvin Johnson, correctly called (SJ 67 Doug Rosenbaum, BJ 93 Scott

Quick calls: Week 4

You can follow our coverage on Twitter, but we will post some of the more notable calls from the weekend here in our liveblog. Did you see something in Sunday's game that you thought was not called correctly? Did you want to give props to an official who made a great

Week 4 referee assignments

Clete Blakeman's crew is in London for the first international game of the year at Wembly Stadium. The game will air during Sunday day games with the time difference. The crews headed by Carl Cheffers and Scott Green are off this week. Assignments compiled with the assistance of Thursday, Sept.