In a statement released by the NFL (via NFL Network's James Palmer), as part of a joint review by the NFL and NFL Players Association, it was determined there was "a failure in the application" by the Seahawks:
The investigation into the Seahawks' application of the concussion protocol stems from Seattle's Week 10 win over the Arizona Cardinals.
Wilson took a hard hit to the head and neck area in the third quarter from Cardinals linebacker Karlos Dansby, who was flagged for roughing the passer on the play.
The Seahawks quarterback was removed from the game for one play, but television cameras showed him running out of the medical tent and back toward the field before doctors could give him a full examination.
The NFL announced on Nov. 10 it was opening an investigation into the situation to determine if any rules had been violated.
In 2016, the Seahawks were fined $400,000 and lost a 2017 fifth-round draft pick for a violation of NFL and NFLPA rules prohibiting excessive contact during offseason workouts.