The NFL Players Association has filed a grievance against the NFL to challenge the league's new personal conduct policy.

The players' union says the new policy has violated the NFL collective bargaining agreement.

The NFL unanimously approved the revised conduct policy in December.

"Te NFL adopted the new Policy without the consent, and over the objections, of the NFLPA," the union said in a statement.

The union referred to Article 2, Section 1 of the CBA that states the CBA "supersedes any conflicting provisions in the Settlement Agreement, the NFL Constitution and Bylaws, the NFL Rules, or any other document affecting terms and conditions of employment of NFL players."

The NFL issued a statement Friday.

"The league's revised conduct policy was the product of a tremendous amount of analysis and work and is based on input from a broad and diverse group of experts within and outside of football, including current players, former players, and the NFL Players Association," the statement read. "We and the public firmly believe that all NFL personnel should be held accountable to a stronger, more effective conduct policy. Clearly, the union does not share that belief."

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Aaron Wilson covers the Ravens for The Baltimore Sun