PFF grading system appears unclear

Rouxble said

Yet every NFL team in the league utilizes PFF's services.

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I keep hearing this and several times during the past few years I've looked for credible verification that NFL teams use PFF's services, what exact services they use and how they use them. I have never been able to find any credible, definitive verification that NFL teams use PFF services.

Do you have any credible, definitive verification that teams use NFL services, what specific services they use and how they use them? Please share the links here if you do.