NEW YORK (AP) — The NFL players’ union is pushing for collective bargaining with the league on the personal conduct policy.

In a memo sent to each NFLPA player representative and executive board member, and obtained by The Associated Press on Thursday, the union cites “the NFL’s mismanagement” of several incidents, including the Ray Rice and Adrian Peterson cases. The memo claims the league has “inconsistencies that have led to the lack of credibility and damage to our brand.”

The union believes the league has not complied with terms of the CBA reached in 2011 in regard to personal conduct discipline. The memo mentions “imposed superficial changes to the adjudication process,” apparently referring to Commissioner Roger Goodell installing stronger punishment for first-time offenders of the policy.

Goodell announced in August a stiffer penalty for players involved with domestic violence, with a six-game minimum.