Lions RB Jahmyr GIbbs posted a picture on social media of teammate Jermar Jefferson that included more than a dozen of the team's protection calls

While the code words help disguise what the Lions are running on a play-by-play basis, teams can identify tells and tendencies simply by watchng the tape. As a result, Campbell knows that a lot of what the team likes to do is not a secret.

Lions head coach Dan Campbell not at all worried about Jahmyr Gibbs inadvertently leaking Detroit’s OL calls in a social media post

Jahmyr Gibbs stirred up a controversy by posting a photo that contained info on the Lions' protection calls, but Dan Campbell isn't sweating it.

On Sunday, Lions head coach Dan Campbell discussed the heated NFC North race ahead of this week’s game against the Packers.

Despite a mind-boggling mistake by Jahmyr Gibbs, Dan Campbell is confident that it's not going to hurt the Lions at all.

Campbell bucks all coaching convention, even when a player makes the major mistake of sharing playbook info on social media.

Detroit Lions head coach Dan Campbell dismissed any concerns about leaked protection calls by running back Jahmyr Gibbs.

Gibbs, 22, accidentally revealed Detroit's protections, visible on a whiteboard at the team facility, in a Snapchat video.

After running back Jahmyr Gibbs exposed the Detroit Lions’ position-group's drop-back codes, coach Dan Campbell said he didn’t care much about the mistake.