A Challenge to Cardinals Coaches, and Others in the NFL

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I’m amazed at how many bad challenge flags head coaches call in the NFL.  It shouldn’t be very difficult for the guys upstairs to view the play carefully and communicate to the coach whether or not a challenge is warranted.  Why isn’t the percentage of successful challenges very close to 100%…it really should be, given the ability for the entire coaching staff to discern the probability of success.

I also could not find any stats on it, but I’d love to see a breakdown by team on which coaches have the highest success rates when it comes to throwing the challenge flag.  If anyone out there can provide those stats, I’d be grateful.